Seiko Cal. 6637 - 791

This Spring Drive model from 1986 features a 44mm Titanium case. Powered by the 6637 caliber with 33j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-0f3c4bcc468d]

Also known as: Helmet, Arnie

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1986

Related Models

• Seiko 3892-617
• Seiko 5624-487
• Seiko 6111-665
• Seiko 6116-130
• Seiko 4543-934
• Seiko 6120-483
• Seiko 6256-101
• Seiko 6356-969
• Seiko 6353-150
• Seiko 7097-429
• Seiko 7062-428
• Seiko 7143-329