Seiko Cal. 5657 - 420

The 5657-420 is a sought-after Spring Drive piece from Seiko's golden era. It features a Green dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-b4a78f4f9e80]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

14.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Green

Jewels

28j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1983

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