The sign in the photo might be hard to read, but it says “Oldest and largest grapevine in California, planted in 1775, covers over 10,000 sq. feet”.  So that was our challenge:  true or not?  Assuming the vine mentioned in Facebook is the same one, we found this:  “The Old Mother Grapevine of San Gabriel Mission was planted in 1861, making her now 148 years old (NOTE: so this is an old entry), and is one of the most beloved plants in California. She’s a Mission grape … A few years back, a team of Spanish researchers did some DNA analysis on the Mission grapes…”  Now whether the dates are right or not, another online source says:  “Žametovka or modra kavčina (Bleu de Cologne), confirmed at 400 years of age, is listed in the Guinness Book of Records as the oldest vine in the world still producing fruit. The old vine was planted in Maribor at the end of the Middle Ages during the Turkish invasions…”  OK, California:  go for it!  Very old, unused postcard with tape remnant on reverse.  Grade: 3