Seiko Cal. 4540 - 597

Seiko 4540-597

This Spring Drive model from 1967 features a 41mm PVD Black case. Powered by the 4540 caliber with 35j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-2c2ab25ea11d]

Also known as: Monster, Sumo

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
41mm
Case Thickness
9.8mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
140m
Dial Color
White
Jewels
35j
Frequency
36,000 bph
Power Reserve
68 hours
Year
1967

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