Seiko Cal. 5644 - 487

Seiko 5644-487

The Seiko 5644-487 represents an important milestone in Seiko's 1970 lineup. Powered by the 5644 caliber with 28j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-27d512b8574c]

Also known as: Sportsmatic

Specifications

Movement
Solar
Case Material
Two-Tone
Case Width
45mm
Case Thickness
13.5mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
70m
Dial Color
Black
Jewels
28j
Frequency
36,000 bph
Power Reserve
55 hours
Year
1970

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