Here's a California Gold Token from 1871, tested with an XLF scanner at 20k gold, this Token is tiny at approx 10mm. Although it was listed on the coin flip as a BG767 I don't know much about Breen-Gillio Tokens at all and I'm not certain that number is even correct! I got it in a trade years ago and figured I would check on it at a later date. That said, I haven't gotten very far with finding information on it at all. It's like the link says, I'll let you read about it! If anyone knows anything about these, please chime in! Anyone? https://www.ngccoin.com/coin-explorer/california-fractional-gold-pscid-84
Oh yeah, I know it's real! Next time I have it in hand I'll take better pics as I just realized the coin flip has scratches on it, hopefully the coin don't, but idk.
I had one a few years ago. I don't remember the BG number unfortunately. Both yours and mine are quarter dollar denominations. There is a site that had a nice library of photos and descriptions. I don't think it has been updated in years. Here is a link to the site. You might get lucky. http://www.calgoldcoin.com There were quite a few fakes made, but yours looks authentic to me. Here is a photo from CoinFacts of a BG 767. In looking at the CoinFacts photo I believe mine may also be a BG 767. The die cracks are all in the same places.