Seiko Cal. 6638 - 415

The Seiko 6638-415 represents an important milestone in Seiko's 1998 lineup. Powered by the 6638 caliber with 36j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-8a30d02ada71]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

36j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1998

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