This item retails new for US$2,000. 

I bought this unit new from Subal and it has served me very well. Selling because i'm no longer shooting underwater.

The viewfinder offers 150% magnification and is suitable for Subal housings. Easy to install with the special tool shown in the photos (looks like plyers with 2 pointed ends). Simply line up with the 2 holes and rotate to install / remove the viewfinder (tool is included).

The viewfinder is is in perfect working condition (including the o-rings). Some asthetic scratches to the black paint (per images) that do not impact the perforance of the viewfinder. My confidence in the unit's condition is demonstrated by 30 day returns (shipping at the buyer's expense).  

In the last photo you can see the anti reflection coating (pink shimmer) on the external side has faded. This has no impact on the performance of the viewfinder and is typical of parts exposed to salt water for even a short time. 

Happy to answer any questions or provide more photos.