Seiko Cal. 5638 - 423

The 5638-423 is a sought-after Spring Drive piece from Seiko's golden era. It features a Navy dial protected by a Sapphire crystal and offers 30m of water resistance. [seikata-wm-a1faa20bc9ce]

Also known as: UFO, Silverwave

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Navy

Jewels

32j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1981

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