Seiko Cal. 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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