Seiko Cal. 6647 - 581

Seiko 6647-581

The Seiko 6647-581 represents an important milestone in Seiko's 1991 lineup. Powered by the 6647 caliber with 20j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-8160e23f92c0]

Also known as: Bullhead, Baby Tuna

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
37mm
Case Thickness
9.6mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
150m
Dial Color
Navy
Jewels
20j
Frequency
21,600 bph
Power Reserve
50 hours
Year
1991

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