As you've probably gathered I'm a big fan of some of the transient technology from the early 70's. I love the thinking that went behind the likes of the Beta 21, tuning fork movements and Megaquartz's. Unlike modern, mass produced ETA quartz movements they were built exceptionally well and to last. Plus at the time they were ridiculously expensive as they were seen as the future of horology but these days they don't command anything like the prices of their mechanical cousins.
As for accuracy my old cal.1510 equipped Constellation 'Stardust' lost a grand total of 2 seconds a year (yes you read that right, a year!), not too shabby for a 40 year old
Cheers,
Gary
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