{"id":2228,"date":"2026-07-08T03:58:01","date_gmt":"2026-07-08T03:58:01","guid":{"rendered":"https:\/\/mexicoplates.com\/?p=2228"},"modified":"2026-07-08T04:01:08","modified_gmt":"2026-07-08T04:01:08","slug":"new-clues-for-1922-m-de-m-mystery","status":"publish","type":"post","link":"https:\/\/mexicoplates.com\/en\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/","title":{"rendered":"New Clues for 1922 M de M Mystery"},"content":{"rendered":"

Where is this 1922 plate from?\u00a0 \u00a0Is it indeed from Mexico, but long believed.\u00a0 But no one has definitive proof and there have been many questions.\u00a0 For examples, the surviving examples (at least two are known) are all five digits long, which seemed very high.\u00a0 It must be from Mexico City, but the “M de M” legend didn’t fit any known early issues for Ciudad de Mexico or Distrito Federal\u00a0 For many years, this plate has been a mystery for license plate historians and collectors.\u00a0 Long believed to be from Mexico, but<\/p>\n

 <\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

 <\/p>\n

This photo shows another crowded avenue, presumed to be in Mexico City.<\/p>\n

\"\"<\/p>","protected":false},"excerpt":{"rendered":"

Where is this 1922 plate from?\u00a0 \u00a0Is it indeed from Mexico, but long believed.\u00a0 But no one has definitive proof and there have been many questions.\u00a0 For examples, the surviving examples (at least two are known) are all five digits long, which seemed very high.\u00a0 It must be from Mexico City, but the “M de […]<\/p>\n","protected":false},"author":2,"featured_media":2236,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2228","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nNew Clues for 1922 M de M Mystery - Tim Stentiford<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mexicoplates.com\/en\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"New Clues for 1922 M de M Mystery - Tim Stentiford\" \/>\n<meta property=\"og:description\" content=\"Where is this 1922 plate from?\u00a0 \u00a0Is it indeed from Mexico, but long believed.\u00a0 But no one has definitive proof and there have been many questions.\u00a0 For examples, the surviving examples (at least two are known) are all five digits long, which seemed very high.\u00a0 It must be from Mexico City, but the “M de […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/mexicoplates.com\/en\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/\" \/>\n<meta property=\"og:site_name\" content=\"Tim Stentiford\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-08T03:58:01+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-07-08T04:01:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/mexicoplates.com\/wp-content\/uploads\/2026\/07\/Edo-Mex-MdeM-1922-689.jpeg\" \/>\n\t<meta property=\"og:image:width\" content=\"1536\" \/>\n\t<meta property=\"og:image:height\" content=\"1676\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"timstentiford\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"timstentiford\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/\"},\"author\":{\"name\":\"timstentiford\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/#\\\/schema\\\/person\\\/d4080072caacdb40f28d452882db4af5\"},\"headline\":\"New Clues for 1922 M de M Mystery\",\"datePublished\":\"2026-07-08T03:58:01+00:00\",\"dateModified\":\"2026-07-08T04:01:08+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/\"},\"wordCount\":113,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/mexicoplates.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/Edo-Mex-MdeM-1922-689.jpeg\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/\",\"url\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/\",\"name\":\"New Clues for 1922 M de M Mystery - Tim Stentiford\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/mexicoplates.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/Edo-Mex-MdeM-1922-689.jpeg\",\"datePublished\":\"2026-07-08T03:58:01+00:00\",\"dateModified\":\"2026-07-08T04:01:08+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/#\\\/schema\\\/person\\\/d4080072caacdb40f28d452882db4af5\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#primaryimage\",\"url\":\"https:\\\/\\\/mexicoplates.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/Edo-Mex-MdeM-1922-689.jpeg\",\"contentUrl\":\"https:\\\/\\\/mexicoplates.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/Edo-Mex-MdeM-1922-689.jpeg\",\"width\":1536,\"height\":1676,\"caption\":\"Urban streetscape with what appears to be an MdeM 1922 plate in the windshield..\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/2026\\\/07\\\/08\\\/new-clues-for-1922-m-de-m-mystery\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/mexicoplates.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"New Clues for 1922 M de M Mystery\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/#website\",\"url\":\"https:\\\/\\\/mexicoplates.com\\\/\",\"name\":\"Tim Stentiford\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/mexicoplates.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/mexicoplates.com\\\/#\\\/schema\\\/person\\\/d4080072caacdb40f28d452882db4af5\",\"name\":\"timstentiford\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/dbaef95cf6d40b0c0bafc96845f2375e7c230acbc64c9b29add1b549f98e5984?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/dbaef95cf6d40b0c0bafc96845f2375e7c230acbc64c9b29add1b549f98e5984?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/dbaef95cf6d40b0c0bafc96845f2375e7c230acbc64c9b29add1b549f98e5984?s=96&d=mm&r=g\",\"caption\":\"timstentiford\"},\"url\":\"https:\\\/\\\/mexicoplates.com\\\/en\\\/author\\\/timstentiford\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"New Clues for 1922 M de M Mystery - Tim Stentiford","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/mexicoplates.com\/en\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/","og_locale":"en_US","og_type":"article","og_title":"New Clues for 1922 M de M Mystery - Tim Stentiford","og_description":"Where is this 1922 plate from?\u00a0 \u00a0Is it indeed from Mexico, but long believed.\u00a0 But no one has definitive proof and there have been many questions.\u00a0 For examples, the surviving examples (at least two are known) are all five digits long, which seemed very high.\u00a0 It must be from Mexico City, but the “M de […]","og_url":"https:\/\/mexicoplates.com\/en\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/","og_site_name":"Tim Stentiford","article_published_time":"2026-07-08T03:58:01+00:00","article_modified_time":"2026-07-08T04:01:08+00:00","og_image":[{"width":1536,"height":1676,"url":"https:\/\/mexicoplates.com\/wp-content\/uploads\/2026\/07\/Edo-Mex-MdeM-1922-689.jpeg","type":"image\/jpeg"}],"author":"timstentiford","twitter_card":"summary_large_image","twitter_misc":{"Written by":"timstentiford","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#article","isPartOf":{"@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/"},"author":{"name":"timstentiford","@id":"https:\/\/mexicoplates.com\/#\/schema\/person\/d4080072caacdb40f28d452882db4af5"},"headline":"New Clues for 1922 M de M Mystery","datePublished":"2026-07-08T03:58:01+00:00","dateModified":"2026-07-08T04:01:08+00:00","mainEntityOfPage":{"@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/"},"wordCount":113,"commentCount":0,"image":{"@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#primaryimage"},"thumbnailUrl":"https:\/\/mexicoplates.com\/wp-content\/uploads\/2026\/07\/Edo-Mex-MdeM-1922-689.jpeg","inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/","url":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/","name":"New Clues for 1922 M de M Mystery - Tim Stentiford","isPartOf":{"@id":"https:\/\/mexicoplates.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#primaryimage"},"image":{"@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#primaryimage"},"thumbnailUrl":"https:\/\/mexicoplates.com\/wp-content\/uploads\/2026\/07\/Edo-Mex-MdeM-1922-689.jpeg","datePublished":"2026-07-08T03:58:01+00:00","dateModified":"2026-07-08T04:01:08+00:00","author":{"@id":"https:\/\/mexicoplates.com\/#\/schema\/person\/d4080072caacdb40f28d452882db4af5"},"breadcrumb":{"@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#primaryimage","url":"https:\/\/mexicoplates.com\/wp-content\/uploads\/2026\/07\/Edo-Mex-MdeM-1922-689.jpeg","contentUrl":"https:\/\/mexicoplates.com\/wp-content\/uploads\/2026\/07\/Edo-Mex-MdeM-1922-689.jpeg","width":1536,"height":1676,"caption":"Urban streetscape with what appears to be an MdeM 1922 plate in the windshield.."},{"@type":"BreadcrumbList","@id":"https:\/\/mexicoplates.com\/2026\/07\/08\/new-clues-for-1922-m-de-m-mystery\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/mexicoplates.com\/"},{"@type":"ListItem","position":2,"name":"New Clues for 1922 M de M Mystery"}]},{"@type":"WebSite","@id":"https:\/\/mexicoplates.com\/#website","url":"https:\/\/mexicoplates.com\/","name":"Tim Stentiford","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/mexicoplates.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/mexicoplates.com\/#\/schema\/person\/d4080072caacdb40f28d452882db4af5","name":"timstentiford","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/dbaef95cf6d40b0c0bafc96845f2375e7c230acbc64c9b29add1b549f98e5984?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/dbaef95cf6d40b0c0bafc96845f2375e7c230acbc64c9b29add1b549f98e5984?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/dbaef95cf6d40b0c0bafc96845f2375e7c230acbc64c9b29add1b549f98e5984?s=96&d=mm&r=g","caption":"timstentiford"},"url":"https:\/\/mexicoplates.com\/en\/author\/timstentiford\/"}]}},"_links":{"self":[{"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/posts\/2228","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/comments?post=2228"}],"version-history":[{"count":2,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/posts\/2228\/revisions"}],"predecessor-version":[{"id":2417,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/posts\/2228\/revisions\/2417"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/media\/2236"}],"wp:attachment":[{"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/media?parent=2228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/categories?post=2228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mexicoplates.com\/en\/wp-json\/wp\/v2\/tags?post=2228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}