Seiko Cal. 6637 - 861

The 6637-861 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6637 caliber with 34j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-4657f72c18c9]

Also known as: Tuna, Flighty

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Navy

Jewels

34j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1969

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