Seiko Cal. 5646 - 992

This Automatic model from 1974 features a 36mm Hardlex-Coated Steel case. Powered by the 5646 caliber with 21j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-ba690ae5b9a6]

Also known as: Helmet, Sea Horse

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1974

Related Models

• Seiko 6668-913
• Seiko 6696-971
• Seiko 7129-872
• Seiko 3818-944
• Seiko 3837-561
• Seiko 5217-512
• Seiko 6660-131
• Seiko 6624-966
• Seiko 6682-659
• Seiko 7050-964
• Seiko 6172-364
• Seiko 4548-509