Seiko Cal. 5657 - 491

The Seiko 5657-491 represents an important milestone in Seiko's 1970 lineup. Powered by the 5657 caliber with 35j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-8f5f3e4005e3]

Also known as: Sportsmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Champagne

Jewels

35j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1970

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