Seiko Cal. 6638 - 787

The Seiko 6638-787 represents an important milestone in Seiko's 1972 lineup. It features a White dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-cd7a1ca09a65]

Also known as: Samurai, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

White

Jewels

24j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1972

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