Hi stevex6,
I waded through some bulls but didn't find yours. Sorry my friend. I also have a Greek coin with a bull that I posted some time ago but has never identified.
I can't make out the letters from the picture of your coin to search by that, but here are the closest things I could find to your coin, no matches but maybe one will be a lead:

Boione, Aiolis, c. 300 B.C.
26572. Bronze AE 11, SGCV II 4173; BMC Aeolis, p. 101, 1 - 4, aVF, 1.425g, 11.0mm, 0°, obverse female head left, wearing earring and necklace; reverse BOIWNIT/IKWN,

Gortyna, Crete, 200 - 67 B.C.
17597. Bronze AE 13, BMC Crete p. 46, 69 ff.; S 3194, F/VF, Gortyna mint, 2.562g, 12.1mm, 0°, 200 - 67 B.C.; obverse head of Apollo right; reverse Î"OΡ/TÎ¥NI, bull butting right; very thick flan with bold high relief features

Unattributed, probably Sicily, c. 3rd Century B.C.
29007. Bronze AE 11, unattributed, probably Sicily, F, 1.370g, 10.6mm, 0°, obverse head right; reverse bull butting right