Seiko Cal. 6631 - 581

The 6631-581 is a sought-after Solar piece from Seiko's golden era. Powered by the 6631 caliber with 33j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-029dfd96f489]

Also known as: Samurai, Golden Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

15.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Green

Jewels

33j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1996

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