Seiko Cal. 3899 - 731

The 3899-731 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3899 caliber with 36j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-a4bb9acd0b7b]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Black

Jewels

36j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1982

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