Seiko Cal. 5644 - 988

Seiko 5644-988

The Seiko 5644-988 represents an important milestone in Seiko's 1970 lineup. Powered by the 5644 caliber with 26j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-3d048018bfe4]

Also known as: Monster, Crown

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
36mm
Case Thickness
9.7mm
Lug Width
20mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
80m
Dial Color
Silver
Jewels
26j
Frequency
28,800 bph
Power Reserve
47 hours
Year
1970

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