Have you seen those lovely RC Cola hanging ads on Ebay? The ones that look like this:
Well, it looks like at least one of them is a repro. Someone bought one from Ebay with exactly the same age lines as the photo on our Web site, and the seller ended up admitting that it was a reproduction. So caveat emptor, keep in mind that if you buy one, it may not really be from the 1940s. But they're pretty neat anyway.