Seiko Cal. 0720 - 634

Seiko 0720-634

The 0720-634 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 0720 caliber with 31j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-d85c2ad9d9ea]

Also known as: Bullhead, UFO

Specifications

Movement
Spring Drive
Case Material
PVD Black
Case Width
39mm
Case Thickness
13.7mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
31j
Frequency
36,000 bph
Power Reserve
61 hours
Year
1996

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