Nauticam NA-GH4 Housing, includes M14 vacuum valve and hand pump.
Selling the housing and vacuum valve/pump for $1650.
If you don't want the vacuum valve and pump, then the housing alone will be $1500.
I used this as a backup housing, and it is in excellent working and cosmetic condition. The photos show the housing with my preferred setup (dovetail plates on top of the arms rather than balls). I will set up the housing as it comes new from the factory, with mounting balls on top of the arms.
The first image is what the housing will look like once I have the time to put the original balls back on the arms. The other images are what the housing actually looks like. You will get the housing in the 2nd and 3rd images, but with ball mounts on top of the arms. I put a GoPro mount on the top of the housing -- I will include the original hardware if you want to remove that mount and put the original shoe on the housing. I strongly advise keeping the GoPro mount on the housing -- it will be difficult to get off for one thing; and it's a far better mount than the shoe that was on there originally -- you can always adapt something to fit into the GoPro mounts, and of course you can put a GoPro in the mount too!
I really enjoy using these housings. They are compact and easy to put together.