50's. Perfect compliment to your vintage bowling shirt. 3/4" tall Gold base pin with Blue enameling. Top and bottom have ribbon panels with Blue enameling. Top says "Calif. State" and bottom says "Club". The ribbons are connected at the side with a bowling pin on either side leaning at a 45 degree angle. In between these pins (and at the center of the pin) is a Gold bowling ball with holes and a square block on top of it with Blue "600". Exc++.
We have a handful of similar pins. If your interested, brief descriptions will be forwarded.