Seiko Cal. 6643 - 721

Seiko 6643-721

This Automatic model from 1977 features a 35mm Two-Tone case. Powered by the 6643 caliber with 30j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-e104c1dcca6f]

Also known as: Sumo, Flighty

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
35mm
Case Thickness
14.7mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Bidirectional
Water Resistance
160m
Dial Color
Champagne
Jewels
30j
Frequency
21,600 bph
Power Reserve
69 hours
Year
1977

Related Models

seikata-wm-e104c1dcca6f