"The chip Mold was used during that time period is correct - 1941-1990’s. If this mold was say only used in the 1980's and later, then that would definitely prove they could not possibly be JFKs set. That is not the case here. This mold was commonly used during that 1950’s - 1960s period according to this chip mold reference: (look for DIAMOND AND SQUARES - DIASQR):

http://www.antiquegamblingchips.com/molddesign_geometric.htm"

The info presented here is wrong. The mold has been in use from 1941 right through to today. The sample chip I showed in the scan was produced last month.

Don't assume that the chips belonged to the case they are in now. They are rarely supplied in cases (Burt Co. never supplied cases period).