Seiko Cal. 3887 - 984

The 3887-984 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 3887 caliber with 31j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-b24a76c5c735]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1978

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