Roman or Greek coin? [решено]

I acquired this coin before I know much about coins and have spent a lot of time trying to find it on Numista. Any assistance in Identifying this coin would be greatly appreciated. I only have limited information about it.

Supposedly it is an Ancient Roman coin
diameter 14-15.8mm
composition maybe billon or silver
weight 1.25g
thickness about 1.2mm

Photos without the holder and with better lighting please. Not much can be said with these photos.

Improved photos

I think this is an indo-bactrian coin or close to it.

I think this is it. Any thoughts from anyone?

https://en.numista.com/catalogue/pieces68693.html

I am very curious about the mark on my coin to the left of the seated figure. Is it a mintmark or monogram? Looks like a square with 3/4 of an X in it with dots on the corners. I found this same mark on the following coin too.

https://en.numista.com/catalogue/pieces168334.html