A little information is a dangerous thing. They must have gone to this web site to look up the serial number:

http://www.bunchobikes.com/serialnumber.htm

Saw that the numbers on the BB shell were pre-1951 and who knows what other "research" they did to come up with the 1939 date. I'd help them out with dating the bike, but with that feedback they'd probably not welcome the suggestion.

Bob Hufford
Springfield, MO