Seiko Cal. 6638 - 416

The 6638-416 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6638 caliber with 32j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-38f9b7bbfc59]

Also known as: Tuna, Helmet

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

15.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Burgundy

Jewels

32j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1988

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