SKU: 24393
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WHAT WE LOVE:
The King Seiko 45-8010 Superior Chronometer is one of the rarest and most revered references in all of vintage Seiko collecting — and the "Superior Chronometer" designation is not a marketing phrase. It is a technical classification, earned through independent certification, that tells a precise and remarkable story.
The standard 45-8010 Chronometer was already a serious achievement — independently certified by the Japan Chronometer Inspection Institute (JCII, established 1968) to Seiko's internal 'A' accuracy grade of -1 to +10 seconds per day. The Superior Chronometer designation applied only to movements that went further: those that met the 'AA' accuracy grade of -3 to +6 seconds per day. This was the same precision standard demanded of Grand Seiko from 1966 onwards. In other words, the Superior Chronometer examples of the 45-8010 were, in measured accuracy terms, Grand Seiko's equals — produced under the King Seiko name, and available today at a fraction of the price equivalent Grand Seiko references command.
The production window for Superior Chronometer examples was extraordinarily short — essentially limited to 1969, making this one of the last King Seikos to carry the Hi-Beat 36,000 bph movement. The case is the distinctive "pebble" or turtle-shaped 8010 architecture — shorter, stubbier lugs than the earlier 7010s, with case flanks that slope sharply downward to create a convex, organic profile that is immediately identifiable and completely beautiful at 37mm. The white sunburst dial carries the full text "Superior Chronometer Officially Certified" — a declaration that appears on very few watches from any manufacturer, Japanese or Swiss, at any price — alongside "Hi-Beat" at the bottom, signed "KS" at 6 o'clock. The applied hour markers with their single black stripe running through centre, matched by the hands, create a dial language that is entirely its own.
WHAT'S INSIDE:
The 45-8010 is powered by the Seiko Calibre 4500A — the hand-wound version of the celebrated Calibre 45 family, beating at 36,000 vibrations per hour (10 beats per second). This is the same high frequency that Grand Seiko's Hi-Beat movements would later become famous for, applied here in a manually wound format that many collectors consider the purest expression of the calibre's capabilities. Serviced May 2026.
FIVEFORTYFIVE SIX MONTHS WARRANTY
