Seiko Cal. 5646 - 597

The 5646-597 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5646 caliber with 18j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-58ad4f0a146a]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

14.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

18j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1976

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