Seiko Cal. 6639 - 254

The Seiko 6639-254 represents an important milestone in Seiko's 1995 lineup. Powered by the 6639 caliber with 28j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-f07d83772517]

Also known as: Helmet, Flighty

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

170m

Dial Color

White

Jewels

28j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1995

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