Seiko Cal. 5631 - 496

Seiko 5631-496

The Seiko 5631-496 represents an important milestone in Seiko's 1977 lineup. Powered by the 5631 caliber with 27j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-62ccc73cfdc5]

Also known as: Helmet

Specifications

Movement
Hand-Winding
Case Material
Two-Tone
Case Width
35mm
Case Thickness
13.8mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
40m
Dial Color
Champagne
Jewels
27j
Frequency
28,800 bph
Power Reserve
69 hours
Year
1977

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