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Message:: [QUOTE="Gao, post: 797273, member: 19409"]Randygeki identified this correctly, and I would say that his estimate of value is about right as well. In case you don't know, the PTR is the mintmark for Triveri (Trier). This coin was minted at some point between 294 and 305.  In case you want some background information: The original name of the denomination is unknown, but it's usually referred to by modern collectors as a follis, though I've heard some call it a nummus. During the third century, there was high inflation, and with it currency debasement. By the end, there was very little precious metal in the circulating coinage. In 294, Diocletian reformed the coinage system, with the follis being the primary unit in circulation. In the beginning, it was probably made of a ratio of 1 part silver to 20 parts copper, and they originally had a thin silver coating. Diocletian's reforms didn't solve the monetary problems of the empire, and inflation and debasement continued. If I recall correctly, we have a record of him doubling the value of the follis to 25 denarii, which means that the unit may have originally had the rather odd value of 12.5 denarii, though some argue that the "doubling" was a bit rough and that it had a value of 12 even originally.[/QUOTE]