Seiko Cal. 4550 - 140

Seiko 4550-140

This Hand-Winding model from 1978 features a 41mm PVD Black case. Powered by the 4550 caliber with 29j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-4297f628b496]

Also known as: Sumo, Helmet

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
41mm
Case Thickness
8.0mm
Lug Width
21mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
140m
Dial Color
Black
Jewels
29j
Frequency
21,600 bph
Power Reserve
37 hours
Year
1978

Related Models

seikata-wm-4297f628b496