Correct on the Royal Arch Masons! A little bit more on it... The coin features a Keystone which is common throughout all lodges. When you receive your Royal Arch Degree, you will also receive a token, like the ones posted. the token, or penny, is signifacant in a couple ways. one of those ways pertains to what you learn during that degree, the other is your Mark. Every Royal Arch mason has a "Mark", their own personal "Mark" , like that of the Masons before them to help them identify who built the structure, like a signature in stone. The middle part of the Keystone on the token (the circle) is for that purpose, your Mark would be engraved there after it is put in the registry. My mark is the All seeing eye in a wolf paw. Pretty interesting that your coin is in as good a shape as it is! they are supposed to be carried on your person...