I just looked at Robert Eisenstadt's site and it says 1960's to present for the B mold ? The others Diasq. H.S. listed in the California book and a nice valuation of $100-$300 for these chips and the $100 isn't listed. Yes I can see why the B mold brings a question. Unless this ship was off the California shore later than the Rex and Tango. Thanks for the inquiry,I picked it up to add to the others still missing a couple from this ship,Torrey