Seiko Cal. 5640 - 717

Seiko 5640-717

This Automatic model from 1979 features a 43mm Hardlex-Coated Steel case. Powered by the 5640 caliber with 36j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-970f3dbc43c3]

Also known as: Helmet, Sportsmatic

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
12.7mm
Lug Width
20mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
120m
Dial Color
Green
Jewels
36j
Frequency
28,800 bph
Power Reserve
69 hours
Year
1979

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seikata-wm-970f3dbc43c3