I repair copiers as well. Well I just retired 3 weeks ago after 33 years of Ricoh Konica Minolta and Sharp. I’ve got a HP 8610 I’ve had 10 or 11 years print 50 or 60 a month on it never a problem never even had to clean anything and I think it’s like what you said and running it on a regular...
Nice watches! I have about 8 eco-drive solars in different models. I keep them in the window seal to keep them charged. The pest control people call me the watch guy lol. They’re a nice mid price watch that’ll give you several great years of service.