Seiko Cal. 0781 - 436

This Spring Drive model from 1979 features a 41mm Hardlex-Coated Steel case. Powered by the 0781 caliber with 21j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-adad91c5552a]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

64 hours

Year

1979

Related Models

• Seiko 4477-868
• Seiko 6634-981
• Seiko 6397-587
• Seiko 5262-193
• Seiko 6299-391
• Seiko 6160-321
• Seiko 6327-953
• Seiko 7159-137
• Seiko 7116-453
• Seiko 4446-139
• Seiko 6672-321
• Seiko 5619-941