QUOTE(southpaw @ Nov 10 2007, 10:37 PM) [snapback]415841[/snapback]
I was thinking 30s-40s, so that seems about right. Thanks for the info thus far and please feel free to add more.
But I think I also saw it in a 1934 Waterman booklet. See the Vintage Waterman Catalog thread in this forum - there's a link to repros of brochures and catalogs.