Seiko Cal. 5631 - 364

Seiko 5631-364

This Hand-Winding model from 1991 features a 46mm Titanium case. With its 20mm lug width and 9.9mm profile, it sits comfortably on most wrists. [seikata-wm-17008dc82c66]

Also known as: Baby Tuna, Flighty

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
46mm
Case Thickness
9.9mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
170m
Dial Color
White
Jewels
35j
Frequency
21,600 bph
Power Reserve
55 hours
Year
1991

Related Models

seikata-wm-17008dc82c66