Seiko Cal. 3871 - 720

The 3871-720 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 3871 caliber with 36j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-109873dcb5bc]

Also known as: Samurai, Tuna

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

110m

Dial Color

Silver

Jewels

36j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1984

Related Models

• Seiko 4472-769
• Seiko 4486-482
• Seiko 3866-686
• Seiko 4529-146
• Seiko 7137-229
• Seiko 7171-671
• Seiko 0726-316
• Seiko 3887-401
• Seiko 4439-887
• Seiko 0770-729
• Seiko 7154-998
• Seiko 6250-632