Seiko Cal. 5691 - 331

The 5691-331 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5691 caliber with 28j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-af7d1af1ce2e]

Also known as: Sportsmatic, Crown

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

14.6mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1975

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