Watches are easy. Since they're manufactured on a worldwide basis,
you can ALWAYS find one with 24h format capability. Just state it
as a requirement at purchase, "am/pm-only" format is a show-stopper.
Unlike cellphones a watch is primarly for timekeeping, and you have
a right to specify your desired format.
Nat
True, but stores have a right to say that they don't sell that type
of watch, in which case you're free to go look for another store.
It's just that unless demand for a 24 hour watch is high enough, it
may be difficult to locate a store that sells them.