Seiko Cal. 3812 - 221

This Spring Drive model from 1997 features a 43mm Gold-Plated case. Powered by the 3812 caliber with 20j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-4a6880f18b22]

Also known as: Sumo, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Green

Jewels

20j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1997

Related Models

• Seiko 6135-967
• Seiko 6229-295
• Seiko 4442-453
• Seiko 4551-846
• Seiko 3847-206
• Seiko 4475-978
• Seiko 6640-463
• Seiko 6279-417
• Seiko 7179-186
• Seiko 7179-895
• Seiko 7089-914
• Seiko 5217-581