: Sorry Chris, I think your question just got overlooked.

: 5 to 7 years is a decent rule of thumb, and the 7734 is pretty
: robust so should be able to cope with that. A decent watchmaker
: will be able to suggest how much needs doing at service, maybe
: one of the ones on here could chip in.

Thank you Mark, that's exactly what I was looking for, a rule of thumb. So now I feel a little more comfortable waiting a year or two to decide if I want to send it back to Heuer to do the service and have them re-install the original sweep while it's there.

Thanks again!