I just bought a watch that has been somewhat of a "grail" watch for me.
It''s a Revue Thommen "Airspeed Altimeter" watch, made in the late 1990's. This watch is one of only two mechanical watches I know of that have an altimeter built into the watch. (The other one is the 1960's vintage Favre Leuba "Bivouac")
It has a hand winding Peseux 7001 movement, and a 30m water resistant titanium case.
These altimeter watches have interested me in part because of my interest in mountaineering. When I first began climbing mountains, Revue Thommen made the standard hand held altimeters used by mountaineers. These mechanical altimeters were fascinating with their jeweled movements and analog dials. These altimeter watches function on the same principles and serve the same function as the classic mountaineer's altimeter I remember fondly from my early climbing days.
I've been looking for either this watch or the Favre Leuba for quite some time now. There weren't many made or either model, and it's been difficult to find one in good condition. Finally, I found a new in box example of the Revue, and snapped it up.
I have not yet received it (It's coming from Europe) but I am pretty excited to finally add a mechanical altimeter watch to my collection. Will take some wrist shots and give my impressions on its functionality when it arrives.