Seiko Cal. 6231 - 478

Released in 1973, the Cal. 6231 with design code 478 was part of Seiko's domestic market collection. With its 21mm lug width and 10.4mm profile, it sits comfortably on most wrists. [seikata-wm-40c80eea9aeb]

Also known as: Monster, Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1973

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