Yes, that date is obviously wrong, since Queen Victoria married Prince Albert in 1830. But that aside, I don't think this proves that "Pop Goes the Weasel" was originally a bawdy song. Isn't it likely that the author of this song borrowed the single line "Pop Goes the Weasel" from a different song that was already in common use, and used it in a suggestive manner? It's been done before (though naturally I can't come up with an example at the moment!)

But thanks for resurrecting this thread, Q. Lots of fun stuff here.

Aloha,
Mark