Seiko Cal. 6637 - 439

This Quartz model from 1966 features a 44mm Stainless Steel case. Powered by the 6637 caliber with 25j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-6f57ac1dea01]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

25j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1966

Related Models

• Seiko 7010-561
• Seiko 5299-190
• Seiko 3862-495
• Seiko 7031-232
• Seiko 0736-143
• Seiko 4457-157
• Seiko 5691-980
• Seiko 6125-841
• Seiko 6241-237
• Seiko 6249-805
• Seiko 6612-458
• Seiko 4485-395