Seiko Cal. 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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