Hi Rich. The palm design is clip art you can find here:

http://clipart-library.com/clipart/qcBXexe4i.htm

As such (and I'm no expert), I wouldn't think anyone but a home gamer would use this logo on their chips as, naturally, anyone could grab this graphic and make fakes more easily than scanning a chip to dup it.

I couldn't find any references to "187" anywhere, at least as it pertains to casinos/chips. Sorry. Hope this helps a bit, at least.