Roughly 10mm across, with the weight coming in at 1.41 grams, which I think would make this a diobol, although I don't see that denomination cataloged. I have it as an issue of Abydos, Troas in a style that's consistent with issues dating from before 480 BC.
An interesting article that covers many ancient Greek coins, but its particular relevance to this thread is in detailing under the archaic category some examples with gammadion (also a primitive form of swastika) incuse reverses.
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