This tiny coin came today:
It is only 4.2-4.8 mm and 0.18 grams. A "tetartemorion" (one quarter of an obol).
The seller described it as "Head of a griffin(?)" possibly for Teos. I didn't think it was and bought it just for it size. At some angles it almost looks like a lion's head left. But, upon close inspection and at this angle I think the most visible thing on it is a large human ear, so it is really an archaic head left, crowded so the tip of the nose, chin, and neck are not on the flan.
It turns out that SNG Turkey I, the Kayhan collection, has #348 from Kolophon, Ionia, "late 6th century" is just like it, including the weight, and several similar coins of the weights 0.12 to 0.24 grams. It is too small to expect the weight to be precise. SNG Danish V Colophon [same place, spelled with a "C"] 133-134 "c, 525-490", are it, with the head named Apollo (0.25 and 0.15 grams). It is really hard to see the photos there. (I wish publications would use x2 or x3 photos for tiny coins.) The coin is tiny and the photos are dark. SNG von Aulock IV 7801 is close (and 0.18 grams), but with only an eye instead of a head. I didn't find it in Klein or Rosen.
Well, I wanted a tiny coin and I got one.