Seiko Cal. 3868 - 931

The 3868-931 is a sought-after Spring Drive piece from Seiko's golden era. The Inner Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-148dad128fef]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

14.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Green

Jewels

33j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1981

Related Models

• Seiko 5669-486
• Seiko 4471-413
• Seiko 4580-201
• Seiko 6293-151
• Seiko 5690-800
• Seiko 3844-185
• Seiko 6360-797
• Seiko 6349-796
• Seiko 0724-957
• Seiko 5657-498
• Seiko 7026-805
• Seiko 7154-351