(1) I am running this auction now:
1929 Agua Caliente $25 crest & seal Tijuana B CA Mexico [That's Baja California]
Item number: 150463695925
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150463695925

The auction is for my $25 Aqua Caliente 1929 chip:

(2) To jazz up my auction with a picture, and to prove the provenance of the chip, I put this picture (of the US Playing Card Co manufacturing/shipment record book page) alongside my chip in the auction:

To save bytes, I cropped the picture. That BC or CB chip of Roy's happened to be included in the picture, but it is from a different order -- nothing to do with Agua Caliente or Mexico. In fact, if I had included the bottom of the picture in my auction, you would see that that the BC (or CB) chip was sent to Aladdin Specialty Co., Chicago , Ill., in 1929 -- 1000 chips. Aladdin, by the way, was a large gambling supply outfit. (I have one of their catalogs.) No other ID that I know of. Aladdin must have ordered it from USPC in Cincinnati for one of their customers.

(3) I happen to have just one of those die-cut BC/CB chips -- in white (also in that picture, but you can't see the design -- white on white).

Robert