Seiko Cal. 6331 - 428

Seiko 6331-428

The Seiko 6331-428 represents an important milestone in Seiko's 1973 lineup. Powered by the 6331 caliber with 25j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-01179084d585]

Also known as: UFO, Bellmatic

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
41mm
Case Thickness
12.0mm
Lug Width
20mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
150m
Dial Color
Green
Jewels
25j
Frequency
21,600 bph
Power Reserve
70 hours
Year
1973

Related Models

seikata-wm-01179084d585