I have the chip in three colors. The white has a horse head on the reverse. The blue and red have the rooster on the reverse.

Interesting that gambling is associated with both the horse and fighting rooster

I always thought the padlock and bar as incorporated in the persons name. The letters shown are MJC

Maybe J McLaughlin. Then again, with a horse head on the back could it come from a ranch, maybe the bar and lock represented a paddock

Bottom line is I haven't the foggiest. I would give someone this fairly expensive chip if they could solve the mystery of who owned it. Only things I'm pretty sure of - the owner was rich and chip is from the 1880-1910 range.