For Sale Omega 2" lens cone w/ 30mm hole lens plate

I am unsure what model this goes with, search shows maybe for a D series or B7/8. There is a single notch in the back and it is 6" square not counting the tab sticking out. There are a few places where the paint has chipped, see picture. $20 shipped CONUS, others send me pm. Prefer paypal, otherwise a money order.

Looks like it's for an Omega B6, B7, or B8.

Thanks for the additional info, and open to offers