Seiko Cal. 5640 - 927

Seiko 5640-927

This Solar model from 1979 features a 45mm Two-Tone case. Powered by the 5640 caliber with 20j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-93bd3254f883]

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
45mm
Case Thickness
12.2mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
150m
Dial Color
Silver
Jewels
20j
Frequency
36,000 bph
Power Reserve
40 hours
Year
1979

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seikata-wm-93bd3254f883