Seiko Cal. 6645 - 742

Seiko 6645-742

The Seiko 6645-742 represents an important milestone in Seiko's 1990 lineup. Powered by the 6645 caliber with 33j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-57e2e44f83e6]

Also known as: Sumo, Baby Tuna

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
46mm
Case Thickness
14.2mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Blue Sunburst
Jewels
33j
Frequency
21,600 bph
Power Reserve
57 hours
Year
1990

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