Seiko Cal. 5657 - 440

The 5657-440 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5657 caliber with 26j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-ba03e9afda7e]

Also known as: Tuna, Flighty

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

170m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1969

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