NOS Tudor Hydronaut II needs service?

[Fred48]

Hi folks,
A few months ago I acquired a NOS Tudor Hydronaut II from about 2010. The watch is in mint condition and runs great: +1 spd on wrist, +/- 2 spd positional variation, .1 msec avg beat error, amplitudes of 270 - 290; a very solid ETA movement with Tudor refinement. The watch is not worn every day as it is in rotation with six watches; so, once every few weeks for a week.

My question is whether I should get it serviced, it being 10 years old although NOS, or should I just leave it as is. (Of course, if I have it serviced, I run the risk of it coming back worse than when it went in.) This was a grey purchase, so no warranty to cover a service.

What do you folks think?

Thanks much,

Fred