Seiko Cal. 5637 - 631

The 5637-631 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5637 caliber with 24j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-52eb7388087b]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

24j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1968

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