Seiko Cal. 6638 - 311

Seiko 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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