Your coin is, if it is true, a smaller variant of the "usual"
Apollo rider coins from Kolophon. Usually they weigh between four an five gram, this variant only between two and three.
Your coin is a
bit corroded, so it cannot clearly be seen whether there is a spear or not. But the position of the rider's
arm is exactly the one for holding a spear.
When searching in
Isegrim for coins with a
head of
Apollo and a magistrate's name ΙΚΕΣΙΟΣ, the only ones with a
horse on the
reverse are from Kolophon.
I don't have alternatives, but it's up to you to continue the
search 
.
Regards
Altamura
