This listing is for a very nice United States Navy Explosive Ordnance Disposal Mobile Unit One Expeditionary Mine Countermeasures ExMCM Co 1-1 Challenge Coin. This coin is 3 1/2 in diameter. 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.