There was a Buckhorn Club card room in Camarillo according to the Chipguide. I think there were a lot of bars named the Buckhorn - sort of a popular name in Northern California so its hard to say where the dice were used unless you could find something in an old newspaper. Most of the illegal crap games were closed down by Pat Brown - Jerry's dad - in 1956 as part of the Kefauver crusade. No idea on the rest of the dice but they do look like old timers.

Strange things do show up out here. I found a set of five dice from the Vapors - an illegal club in Little Rock, Ar - in an antique store in Redding a few years ago.