Seiko Cal. 6638 - 575

The Seiko 6638-575 represents an important milestone in Seiko's 1985 lineup. Powered by the 6638 caliber with 24j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-8cac4a035c97]

Also known as: Monster, Arnie

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

35mm

Case Thickness

8.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

24j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1985

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