Seiko Cal. 6637 - 775

This Automatic model from 1971 features a 39mm Stainless Steel case. Powered by the 6637 caliber with 29j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-0445c013a130]

Also known as: Helmet

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

10.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Black

Jewels

29j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1971

Related Models

• Seiko 6694-614
• Seiko 7139-871
• Seiko 6385-963
• Seiko 5215-926
• Seiko 6626-394
• Seiko 6656-111
• Seiko 6138-395
• Seiko 6260-961
• Seiko 6326-765
• Seiko 5236-409
• Seiko 6337-332
• Seiko 6687-849