watchmaker; clockmaker
A professional who makes, repairs, or designs watches and clocks. The term is neutral and can refer to both modern and traditional horologists.
He is a watchmaker who trained in Switzerland.
I had this old wall clock repaired by a skilled clockmaker.
時計屋 is a more casual term for a watch shop or watch seller, while 時計師 specifically refers to a skilled craftsman or horologist.
Standard kanji spelling for a professional watchmaker or clockmaker.
Alternate kanji spelling using 士 (professional suffix). Less common than 時計師 but still encountered.
Compound of 時計 (clock/watch) and 師 (master, expert). The spelling 時計士 uses 士 (professional) with a similar meaning.