I have a bunch of molded blue and red clay chips that are hot stamped on one side with a covered wagon and on the other side with large initials of "PPB." I got them some time ago from a fella in Fargo, ND. They are enclosed in an old round wooden dispenser or tray with a brass handle. On either side of the handle are slots for decks of cards. Anybody possibly know what the origin of these chips might be? Thanks!