Need Help Iding Unidentified Greek Bronze

Hi everyone,
I just acquired this unidentified Greek Bronze from an old collection. However, it did not come with any identifying information, and I am having difficulty deciphering it.

It is 25mm and is 12.97g.

The obverse features a helmeted and bearded male head left. However, there is no text.

The reverse is a bit more difficult to make out. It appears to have a standing figure holding a staff or spear. And the figure may also be holding a shield. A previous owner appears to have inked the back of the coin with the number "73."

Any help IDing this coin would be appreciated! Thanks.