Seiko Cal. 6637 - 226

The 6637-226 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 31j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-eda67613f922]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Silver

Jewels

31j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1984

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