Seiko Cal. 6638 - 311

The Seiko 6638-311 represents an important milestone in Seiko's 1984 lineup. Powered by the 6638 caliber with 24j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-3a9b225c27e9]

Also known as: Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Silver

Jewels

24j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1984

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