The product is a circulated brass token from the Royal Novelty Co. located on 411 Market St. in San Francisco, California. Measuring 21mm in size, this token holds historical significance as a piece of US trade exonumia. It is a unique collectible item that represents a time when tokens were commonly used for various transactions and entertainment purposes.

Could be TC-168686 (Alpert/Smith Amusement 760-RRR, Kappen 2255).....OR.....TC-384791 (Alpert/Smith Amusement 760-RRO.....OR.....TC-239835 (Kappen -2256)  depending on the size of the center hole --8mm or 7mm.  Not measured.   

They have been in my family for 80 years, at least!