Seiko Cal. 6631 - 191

This Quartz model from 1983 features a 36mm PVD Black case. Powered by the 6631 caliber with 23j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-3a0bf0059d0b]

Also known as: Sumo, Emperor

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Black

Jewels

23j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1983

Related Models

• Seiko 5662-743
• Seiko 7154-161
• Seiko 3837-940
• Seiko 7031-975
• Seiko 6644-251
• Seiko 7176-400
• Seiko 6132-790
• Seiko 4431-764
• Seiko 6615-460
• Seiko 3875-417
• Seiko 6653-416
• Seiko 6119-595