Seiko Cal. 4421 - 231

Seiko 4421-231

This Hand-Winding model from 1978 features a 40mm Hardlex-Coated Steel case. Powered by the 4421 caliber with 17j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-c525ef6aa2e2]

Also known as: UFO, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
40mm
Case Thickness
9.2mm
Lug Width
22mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
160m
Dial Color
Navy
Jewels
17j
Frequency
28,800 bph
Power Reserve
46 hours
Year
1978

Related Models

seikata-wm-c525ef6aa2e2