Ionia, Kolophon. ca 389-350 BC. AE 12mm - possibly unpublished symbol

Ionia, Kolophon (Colophon), ca 389-350 BC.  AE 12mm (2.17g).  Laureate head of Apollo right / Lyre within linear square; KOΛ to right, thyrsos or bow in case (?) to left.   

Milne, Kolophon, 81A (thyrsos). 

gVF, dark green, glossy patina - tiny and beautiful piece of classical art (quite nice in hand).  Very rare and possibly unpublished!

The symbol to left of the lyre on the reverse appears to be a bow in case, which is not published in any of the standard references, including Milne (the standard reference for Colophon).  It could be a thyrsos (with the top part representing the pine cone - Milne 81A, a very rare variant itself), but this tiny coin in hand really seems to show a bow case.  The other possible variations - corn ear and astragaloi - do not seem to apply.  You judge for yourself.