Seiko Cal. 6331 - 581

Seiko 6331-581

The Seiko 6331-581 represents an important milestone in Seiko's 1970 lineup. Powered by the 6331 caliber with 29j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-8346c7c5de70]

Also known as: Sea Horse

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
40mm
Case Thickness
12.1mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
90m
Dial Color
Blue Sunburst
Jewels
29j
Frequency
28,800 bph
Power Reserve
49 hours
Year
1970

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seikata-wm-8346c7c5de70