Seiko Cal. 5640 - 730

Seiko 5640-730

The 5640-730 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5640 caliber with 20j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-6d2f7caa65c4]

Also known as: Monster

Specifications

Movement
Kinetic
Case Material
Gold-Plated
Case Width
42mm
Case Thickness
14.7mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
50m
Dial Color
Champagne
Jewels
20j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1977

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