Recently I purchased a little scruffy looking coin that I thought was Men but I couldn't find it anywhere. So I decided to look at the reverse and that was just as hard. There are many coins with an eight-rayed star and several with Greek lettering. But I couldn't find anything with the Greek letters. By chance I was looking for a different coin in Pontos and found an example of my coin! Yay me! A bit more research, well quite a bit more research, and I can only find 5 other examples. One being a plate coin in SNG Volume XI. I'm very happy to add this coin of Men form Pontos, Pharnakeia! (Circa 85-65BC), AE 2.72g, 15mm Here's a link to one of the 5 found on CNG archives. There is a similar coin that has been grouped into this series but the bust is different "style" has a beaded border and the letters are in 3-rows around the star. I'd call it a different coin.
Congrats on an interesting coin. I was not familiar with Men from Pontos, Pharnakeia and had to do a bit of googling. Coin descriptions call what is on his either a Phrygian helmet or a Phrygian hat. I found a couple of pics:
