Thanks! There's an aneroid barometer inside, connected to that red needle. The outer bezel is used as an altimeter, with 1=100 feet, so that "100" means 10,000 feet (this is the English-system bezel; there is also a metric one that goes up to 30 (3,000m)). When hiking (or flying your triplane), you set the bezel altitude to the barometer needle at a known altitude, and then, barring major changes in the weather, you have an altimeter. More here: http://orologi.forumfree.it/?t=66254963#entry537137295 ...and here: https://omegaforums.net/threads/favre-leuba-bivouac-calibrating-the-barometer.25459/
Still doing the Speedy Gonzales watch for today but now on a different band for the gym...a newly acquired Raine Inc. protective watch band that is 2" wide (wider and more protective than the Rothco protective watch band). Giving it a dry run at the gym before reporting for duty at the donut factory...
Second full day with my newly acquired 1675, thanks to @Varnado Can't get enough of this watch. Needs a nice faded insert though.
Slight change to something more formal for my evening recitation 'Tae The Lassies' Guaranteed to give Lady 'A' a laugh