Seiko Cal. 6637 - 156

The 6637-156 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6637 caliber with 31j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-26b221ccdb13]

Also known as: Silverwave, Navigator

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

36mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1987

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