Seiko Cal. 3864 - 620

The 3864-620 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3864 caliber with 32j jewels beating at 28,800 bph, it delivers a 59 hours power reserve. [seikata-wm-0eaddebd42b6]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

12.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Cream

Jewels

32j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1978

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