Seiko Cal. 5640 - 254

Seiko 5640-254

The Seiko 5640-254 represents an important milestone in Seiko's 1991 lineup. Powered by the 5640 caliber with 20j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-07d4a67b5413]

Also known as: Monster, Golden Tuna

Specifications

Movement
Solar
Case Material
Gold-Plated
Case Width
35mm
Case Thickness
8.1mm
Lug Width
18mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
50m
Dial Color
Champagne
Jewels
20j
Frequency
21,600 bph
Power Reserve
57 hours
Year
1991

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