Seiko Cal. 6637 - 406

Seiko 6637-406

The Seiko 6637-406 represents an important milestone in Seiko's 1986 lineup. Powered by the 6637 caliber with 36j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-9c547e8c6959]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
15.7mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
120m
Dial Color
Navy
Jewels
36j
Frequency
21,600 bph
Power Reserve
59 hours
Year
1986

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