Reefnet +10 supplemental lens. Very good condition. No watermarks, couple thin minor scratches (not visible in images). $140.
Also Nauticam flip door in very good condition. Opens and closes very smoothly, however the detent that holds the door open does not work. I used a rubber band attached to my housing handle and simply held the handle open with that. $155.
If you buy both $275. Will ship anywhere, just pay actual shipping (and insurance if wanted). Cheers