Seiko Cal. 6638 - 151

The 6638-151 is a sought-after Spring Drive piece from Seiko's golden era. It features a Cream dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-b46b53f9f62b]

Also known as: Monster, Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Cream

Jewels

19j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1988

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