Seiko Cal. 6642 - 636

The Seiko 6642-636 represents an important milestone in Seiko's 1985 lineup. Powered by the 6642 caliber with 21j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-f9d6cfd3b529]

Also known as: Helmet, Sea Horse

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

45mm

Case Thickness

9.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Cream

Jewels

21j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1985

Related Models

• Seiko 7061-986
• Seiko 7125-166
• Seiko 5671-488
• Seiko 6155-516
• Seiko 3821-481
• Seiko 6270-544
• Seiko 4593-679
• Seiko 0734-426
• Seiko 4489-744
• Seiko 3867-998
• Seiko 6264-702
• Seiko 6217-821