Seiko Cal. 5257 - 921

Seiko 5257-921

The 5257-921 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5257 caliber with 34j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-dc136b6ed2f9]

Also known as: Sumo

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
38mm
Case Thickness
9.9mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
190m
Dial Color
Navy
Jewels
34j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1998

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seikata-wm-dc136b6ed2f9