Seiko Cal. 5646 - 509

The Seiko 5646-509 represents an important milestone in Seiko's 1977 lineup. Powered by the 5646 caliber with 31j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-15f188b8620e]

Also known as: Sumo, Emperor

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1977

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