New to me sub 14060M- service it?

[Tricolore66]

I would pressure test it for sure. If the power reserve and timekeeping are all within spec I don’t think I’d service it now. These aren’t car engines that can seize up in catastrophic failure if they’re not serviced. Poor timekeeping or a drop in power reserve is a sign of requiring service. I’m sure the RSC loves it when people service perfectly functioning watches every three years.