Seiko Cal. 6657 - 537

The 6657-537 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6657 caliber with 21j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-cf48685db987]

Also known as: Sumo, Rally

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Burgundy

Jewels

21j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1970

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