Seiko Cal. 3857 - 978

The 3857-978 is a sought-after Automatic piece from Seiko's golden era. Powered by the 3857 caliber with 25j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-d7911d95266b]

Also known as: Helmet, World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1985

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