Seiko Cal. 6657 - 239

The 6657-239 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6657 caliber with 35j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-b102a1418d4e]

Also known as: Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

White

Jewels

35j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1966

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