Seiko Cal. 5630 - 657

The Seiko 5630-657 represents an important milestone in Seiko's 1977 lineup. Powered by the 5630 caliber with 19j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-3a5df629f62d]

Also known as: Crown, Arnie

Specifications

Movement

Solar

Case Material

Titanium

Case Width

36mm

Case Thickness

8.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Navy

Jewels

19j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1977

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