Seiko Cal. 3817 - 940

The 3817-940 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3817 caliber with 21j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-53487949b116]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

10.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

130m

Dial Color

Champagne

Jewels

21j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1973

Related Models

• Seiko 6390-240
• Seiko 6168-497
• Seiko 0791-476
• Seiko 6238-189
• Seiko 5668-293
• Seiko 5677-862
• Seiko 3861-518
• Seiko 4468-728
• Seiko 5251-147
• Seiko 7091-845
• Seiko 4580-718
• Seiko 7185-452