Seiko Cal. 3870 - 857

The Seiko 3870-857 represents an important milestone in Seiko's 1999 lineup. Powered by the 3870 caliber with 22j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-89a3a4f3027d]

Also known as: Tuna, Sea Horse

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

39mm

Case Thickness

13.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1999

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