Seiko Cal. 6331 - 738

Seiko 6331-738

Released in 1978, the Cal. 6331 with design code 738 was part of Seiko's domestic market collection. Powered by the 6331 caliber with 27j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-faee9c6befa6]

Also known as: Turtle, Monster

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
39mm
Case Thickness
14.8mm
Lug Width
21mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
60m
Dial Color
Black
Jewels
27j
Frequency
36,000 bph
Power Reserve
42 hours
Year
1978

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