Seiko Cal. 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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