Seiko Cal. 3857 - 646

The 3857-646 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 3857 caliber with 33j jewels beating at 21,600 bph, it delivers a 62 hours power reserve. [seikata-wm-79ab5a775e1d]

Also known as: Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Burgundy

Jewels

33j

Frequency

21,600 bph

Power Reserve

62 hours

Year

1989

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