Seiko Cal. 6656 - 537

Seiko 6656-537

The Seiko 6656-537 represents an important milestone in Seiko's 1968 lineup. Powered by the 6656 caliber with 17j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-ecebed1ef6f9]

Also known as: Sportsmatic

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
11.5mm
Lug Width
20mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
110m
Dial Color
Green
Jewels
17j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1968

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