Sounds right. 1492 has to be after 1955 - first recording I've found is 1992.

Christopher Columbo, though, is well-established, one of the clasics. "Salty Dick" gives 'from the late 19th century.' It occurs in Legman/Randolph, Unprintable where the notes shound be as good as any but I'm in Raleigh at the moment and didn't bring it (or Erotic Muse) with me.

I also have a note it's by one Francis Bryant. Greenhaus saith a parlor version (in DigTrad) "made a hit on Broadway in the late 19th century. It probably preceded the more common feelthy versions. From Flashes of Merriment, Levy." ie, 1893 at CHRISTOFO COLUMBO