Seiko Cal. 6637 - 326

This Automatic model from 1981 features a 40mm PVD Black case. Powered by the 6637 caliber with 31j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-d1a9a03a9525]

Also known as: Sea Horse

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

100m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1981

Related Models

• Seiko 4484-710
• Seiko 6676-514
• Seiko 5264-145
• Seiko 7017-186
• Seiko 7041-434
• Seiko 7053-515
• Seiko 4594-124
• Seiko 4568-683
• Seiko 3883-901
• Seiko 7069-103
• Seiko 4547-548
• Seiko 4455-632