Oris ProPilot Altimeter Automatic Pilot Watch 01 793 7775 8734-SET

Reduced down in their sale from £5350 to £3395, a saving of £1955, 37%.
A bit of a niche product, unless you are a pilot or parachutist. I test flew one and was quite impressed with it.
Meet the new ProPilot Altimeter, the worlds only watch to combine a mechanical altimeter with an automatic mechanical movement.
Like the best adventure watches, the ProPilot Altimeter is innovative, lightweight, legible and loaded with functions. Its built-in altimeter can gauge altitude to 19,700 feet, while its 47 mm carbon fibre case means the watch weighs just 98 grams.
This second generation piece is better than ever: Higher, Slimmer, Lighter.
Higher: Thanks to a new pressure box, it can now gauge altitude up to 6,000 metres
Slimmer: Because Oris have upgraded the movement to the thinner Calibre 793, which also has a bigger 56-hour power reserve. The watch is 1mm thinner than the previous generation.
Lighter: Its case is made of a pioneering carbon fibre and PEKK composite Oris have brought into watchmaking for the first time.