Diablo Numismatic Society

The Diablo Numismatic Society is the oldest coin collecting club in Contra Costa County, established in 1960 and serving over 70 dedicated numismatic enthusiasts. Located in Clayton, this organization meets monthly at the Clayton Community Library to discuss and share expertise in coins, collectibles, and numismatics. Whether you're a seasoned collector or beginning your journey into coin collecting, the society provides a welcoming community for buying, selling, and trading numismatic items with fellow collectors.