Seiko Cal. 5631 - 685

Released in 1971, the Cal. 5631 with design code 685 was part of Seiko's domestic market collection. It features a Silver dial protected by a Mineral crystal and offers 170m of water resistance. [seikata-wm-22e9cb24cbaa]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.9mm

Lug Width

19mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

34j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1971

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