My apologies for the poor photo. It's late (for me) and I haven't dragged out all my regular photo equipment. Plus, the coin is only 9 mm, so I'm forced to use my USB microscope. Weight is 0.6 g. I'm fairly certain that it is from Klazomenai, in Ionia, because (in hand) there is a clearly a "K Lambda" above the ram, (standing right, on the reverse). I think the obverse is Athena, facing right. I can't find any other examples on the internet. Is it unpublished? This coins seems about half the size of a typical bronze from Klazomenai. I assume this coin is from ca. 4th century B.C. Has anyone ever seen one like this before? Anyone know of a reference?
From ISEGRIM: IONIA, Clazomenae. 400-300 BC. AE. Obverse: HEAD WOMAN R / ATHENA (HELMET). Reverse: ΚΛΑ; ANIMAL STANDING R / RAM . 1. 8.89mm BMC Ionia p. 24, #54
I have a couple of tiny bronzes from Klazomenai which I also could not find. I looked through Imhoof and other public domain resources. What's the device above your ram? Could it be a pigasus? That's why I bought mine. I was unable to find this coin with mention of a winged boar above the ram, although maybe it just wasn't mentioned. IONIA, Klazomenai 4th century BC AE10.7, 1.53 gm. Obv: head of Athena right Rev: ram lying left, winged boar above, phi-ANOK Ref: Not in literature consulted. (same general description as above, not sure of the legends or other letters)
IONIA, Klazomenai. Mid-late 4th century BC. Æ (10mm, 1.36 gm, 12h). Obv: Helmeted head of Athena right. Rev: ΚΛΑ, head of Ram, right. BMC 22, 43; SNG Copenhagen 29; von Aulock__.
One of my earlier flying pigs IONIA. Klazomenai. Hemiobol (5th century BC). Obv: Forepart of winged boar right. Rev: Quadripartite incuse square. SNG von Aulock 1985; Klein 817. Sear p. 326 Weight:.33g. Diameter: 6 mm.
It's just the KΛ. I assume there was also supposed to be an A, but I think it's off the flan. I will try to take a better photo of it this weekend. What is Imhoof? I haven't heard of that.
Here's a better photo of the OP: It looks a lot like PeteB's coin. The Lambda doesn't show up well in the photo, but you can see the K . . .A