Seiko Cal. 4437 - 670

The Seiko 4437-670 represents an important milestone in Seiko's 1987 lineup. Powered by the 4437 caliber with 17j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-418df5fc4fe7]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

46mm

Case Thickness

13.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1987

Related Models

• Seiko 7073-535
• Seiko 6155-344
• Seiko 4466-210
• Seiko 6363-721
• Seiko 6394-293
• Seiko 5242-699
• Seiko 6360-481
• Seiko 0717-760
• Seiko 6665-418
• Seiko 4590-168
• Seiko 6217-525
• Seiko 5269-986