Manufacturer Seiko Caliber Number 7A28, 7A28A Type Quartz Diameter 31.1mm (overall) Casing Diameter 29mm Thickness 3.5mm Battery Cell 394 (SR936SW)...
Caliber Spec
Manufacturer Hattori aka Seiko Instruments Inc. (SII) Caliber Number VD77, VD77A Type Quartz Lignes 10.5”’ Diameter 23.7mm Casing Diameter 23.3mm...
Manufacturer Hattori aka Seiko Instruments Inc. (SII) Caliber Number VD51B Type Quartz Lignes 12 3/4”’ Diameter 29.5mm x 26mm (smaller...
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The differenece is the beat rate. 3Hz vs 5Hz. 6 beats/s vs 10 beats/s.
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the VH-31 movement coupled with solar or kinetic in a Seiko watch would sell like…
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Active Caliber Listings
It might be a Chinese Standart-movement aka Tong Ji aka 7120 / SS7 with an…
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Apart from the fact, that there is no further information about this caliber anywhere, it…
This £80 lorus has the y676c with Japan on the rotor
Minute hand on some ETA's 2-hand quartz movements run every 20 secs so that the…