https://en.wikipedia.org/wiki/History_of_watches#1920_Wristw...
I have a 1913 wristwatch in my collection. But, I don't seem to have time to wear that and many fine mechanical watches any more; my smartwatch is so useful I end up wearing that instead.
Sometimes I think that it is somewhat disappointing that things didn't work out the way this mid-1980s science fiction game thought they would:
https://www.dropbox.com/s/nunnwt6ex5bo7e6/hand_computer.pdf?...
The "tech level" indicates which level of technology is needed for a particular piece of equipment to be available and/or normal (won't get you burned at the stake for using "magic") - in Traveller it is used to label different worlds in the universe AFAIK - with GURPS it also extends to cross-dimensinal travel, alternate realities, time travel etc.
https://en.wikipedia.org/wiki/Traveller_%28role-playing_game...
(I had realised it should have been from a rpg, but I kept the game term from the previous comment to avoid confusion)