Nice find. Coppercoins says $45.00 in XF. I wouldn't put too much stock in their prices but still a good one. Was it a cherrypick?
I would need a better photo to tell if it was OMM-2. I see what appears to be the portion on the vertical of the D, but I can't see the middle of the S within the D.
I'm pretty sure it's there. I took the liberty of borrowing the OPs pic and increased the size a little and brightened it.
your pic is not clear .. i cant tell but from the one close pic of the mint mark looks like d/d from the normal pic