I'm a motor head and have worked on cars, motorcycles, lawn mowers (watches) etc. since I was a kid. One time working on a Alfa coupe reaching under the carburetors I shorted my wedding ring on the positive cable going to the starter. Blew the ring off my finger and gave me a nasty burn. I have not worn a ring since and take my watch off when in the shop. A nice watch is fine just take it off when wrenching.Having been a mechanic for over 30 years, don't buy him a watch, that's what they made wall clocks for, watches get caught on things and can cause loss of fingers, hands, etc.