This listing is for a very nice RARE United States Navy Australia Anti-Submarine Warfare ASW Tactics Secret YESFORN Intelligence Challenge Coin. This coin is 2 3/8 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.