Seiko Cal. 4420 - 639

This Spring Drive model from 1993 features a 42mm Stainless Steel case. Powered by the 4420 caliber with 27j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-4efc90e720a9]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

12.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Green

Jewels

27j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1993

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