Tritium hands and airplanes.

MRC

Can I add something? People now can buy pretty indestructible watches, not just G-Shock any decent modern watch. But 50, 60 years ago our watches were purchased as tools, we expected them to go with us everywhere. Baring major impact they could and did hang in there. My first "good" watch, the Carerra above has been taken on car rallies as driver and navigator up to National level. It's been on wrist my while mechanicing on International rallies. It has been taped to the steering wheel of race cars. I wore it during fore-deck sail changing in races across the North Sea, I wore it riding my bicycles. It is still going just fine.

What did I not do wearing it? Reach inside computer cabinets in the days of 3-phase power supplies and naked 300 amp power buses. Reach inside a modern desk-top computer -- too many sharp edges (and always have a band-aid handy...). Hold a chisel (with a big hammer in the other hand or even a small hammer). There are some power tools I'd avoid too.

From posts here it looks to me as if most of the damage people do comes from dropping a watch onto a hard surface, if it's on your wrist you can't drop it can you? (Getting a NATO strap hooked up excepted 😬 )

Archer

And vintage watches are shipped all around the globe in the unpressurized cargo holds of airplanes, and they don't fall apart.

Your concern is really not warranted.

coronado

I've had a 1960s vintage watch with tritium hands at 16,355 feet... no cracked luminous, no exploded crystal, no fogging. I didn't even notice time passing more quickly due to gravitational time dilation caused by the increased altitude. The only problem was that it was too cold to push back the sleeve of my jacket to check the time.