Seiko Cal. 5640 - 392

The Seiko 5640-392 represents an important milestone in Seiko's 1990 lineup. Powered by the 5640 caliber with 35j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-ec9aab455451]

Also known as: Bullhead, Rally

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

11.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

White

Jewels

35j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1990

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