Seiko Cal. 5646 - 509

Seiko 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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