Seiko Cal. 6657 - 235

The 6657-235 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 71 hours power reserve. [seikata-wm-4c9fdc7bc8bb]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

37mm

Case Thickness

10.8mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Cream

Jewels

21j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1970

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