Seiko Cal. 3870 - 866

Released in 1990, the Cal. 3870 with design code 866 was part of Seiko's domestic market collection. Powered by the 3870 caliber with 29j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-e4ca91bc3e49]

Also known as: Sumo, UFO

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Navy

Jewels

29j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1990

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