The world of "High Accuracy Quartz" watches (as they've been dubbed by the online watch community, where "HAQ" is a recognized acronym) is a highly specialized one, but within that world, there are a number of technically intriguing timepieces, including such forgotten exotica as the Pulsar PSR-10 and PSR-20, which were accurate to, respectively, 10 and 20 seconds ± per year.
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