My Broadarrow PRS-4. Worn almost 24/7, now on its second lithium battery (i.e. going on a decade). My pilot watch, practicality incarnate and with the secret knowledge that only a very small number exist.
If not that one, very occasionally my old Edox Delfin, my very first watch I bought as a teenager with money earned on a summer job. Steel, waterproof, handwound, indestructible, only serviced once in 40 years and still runs accurate; it winds smooth as butter. If the lume still worked I'd probably wear it a lot. My ultimate backup that always works. And it always make me think of the small watch store in Switzerland (Thun) where I bought it from an elderly gentleman whom I asked for an indestructible watch, and my mother's shocked face when I returned to our rented holiday home, filled the sink, plunged in the Delfin and let it sit there for a while to see if it was indeed waterproof (it was). :-)