Seiko Cal. 3864 - 721

The 3864-721 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 3864 caliber with 34j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-30f04fc4ef28]

Also known as: Bellmatic

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

190m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1969

Related Models

• Seiko 5616-371
• Seiko 5627-723
• Seiko 6132-329
• Seiko 5249-709
• Seiko 4420-339
• Seiko 7082-834
• Seiko 7094-155
• Seiko 5637-547
• Seiko 6681-197
• Seiko 6359-582
• Seiko 3886-150
• Seiko 7086-159