Seiko Cal. 5633 - 310

The Seiko 5633-310 represents an important milestone in Seiko's 1979 lineup. Powered by the 5633 caliber with 28j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-acd66d1650f0]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Cream

Jewels

28j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1979

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