You are of course right that maintenance is a definite Achilles heal of some of those super vintage options. By the way : LOVE the Zenith Time Command and the Heur Digitals of all flavours. Probably a weird take from me is that the research into them is probably of more overall interest than the ownership in most instances - so can enjoy them without worrying too much about the maintenance side. Fortunately there are quite a few wizards out there that have been able to help sort some of mine and have not had any tragic episodes yet (I’m sure they are in the post though!)
There is so much story in so many digital watches! Check out the worlds most vertical watch https://www.sothebys.com/en/buy/auction/2021/space-exploration/sts-41-g-and-sts-31-kathy-sullivans-twice-flown , the history behind the design of the Omega X-33 or the driving history of the Heur Chronosplit . Giugiaros designs for Seiko worn by Ayrton Senna. There is great stuff out there!
Consider a stainless steel one. How about a pseudo analog display or an ana digi . There is big world of digitals out there beyond the plastic hunks! Simply promoting an augmented reality :)
The Nivada Grenchen 3-6-9 options are pretty cool and have some serious heritage too. I’ve not read the book but it looks cool : https://nivadagrenchenofficial.com/pages/super-antarctic-the-book
HAQ is the rabbit hole you need to go down. Thermocompensated Quartz the other thing to look up. If you are wanting accuracy then radio controlled watches with multi band 6 probably more relevant than the Quartz movement.
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