Seiko Cal. 5660 - 638

Seiko 5660-638

The Seiko 5660-638 represents an important milestone in Seiko's 1984 lineup. Powered by the 5660 caliber with 21j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-40938f8ddf8b]

Also known as: Turtle, Tuna

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
8.8mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
120m
Dial Color
Burgundy
Jewels
21j
Frequency
28,800 bph
Power Reserve
42 hours
Year
1984

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