Are vintage Seiko/Epson movements more accurate than modern offerings?

I just removed my early 1990’s Epson movement Fossil from its tin, after weeks of storage, to find it had only gained about two seconds. Remarkable!

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Though my new quartz watches are marvelously-accurate…I believe the Epson in my old Fossil bests them. Even my new Islander Bethpage with its USA 5 jewel movement falls short.

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[Islander Bethpage Amerigraph movement]

What’s your experience with vintage quartz movements? Are they more accurate? Or is this just a serendipitous fluke?

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Impressive