what is the origing of a small blue hard coin with opa blue point printed on both sides and # 1 in the center?

Answer 1

The OPA (Office of Price Administration) distributed and maintained records of ration stamps, ... blue tokens were used to make change for red and blue stamps and were worth one point each

There are 30 different red tokens and 24 blue ones. They are all celluloid and 16mm in size. Blue ones read: OPA Blue Point 1 (with two different letters) ...

There are many collectors who purchase these tokens. See list below.

Answer 2

Well Y!Armlady hit the nail on the head, so no need to add anymore here, except that they are usually on auction, at Yahoo Auctions.