Seiko Cal. 6637 - 309

The 6637-309 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6637 caliber with 27j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-075b69f1a5a6]

Also known as: Sportsmatic, Crown

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

40mm

Case Thickness

15.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1973

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