This listing is for a very nice Original United States Navy Mobile Diving Salvage Unit One Harbor Clearance Unit Challenge Coin. This coin is 1.5 in diameter and is individually numbered #19. This will make a nice addition to any collection. Any questions, please feel free to ask. I always strive to deliver prompt and accurate results. If you are dissatisfied for any reason, please let me know and I will do my best to resolve the issue to your satisfaction. Just add the items to your cart and request an invoice.