Seiko Cal. 3864 - 121

The Seiko 3864-121 represents an important milestone in Seiko's 1981 lineup. Powered by the 3864 caliber with 17j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-60bce5511b7e]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

10.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Cream

Jewels

17j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1981

Related Models

• Seiko 6259-618
• Seiko 6196-144
• Seiko 4485-497
• Seiko 5248-980
• Seiko 7194-875
• Seiko 3817-909
• Seiko 5619-705
• Seiko 6264-779
• Seiko 3877-758
• Seiko 3847-728
• Seiko 5260-150
• Seiko 7096-496