Seiko Cal. 4531 - 721

The 4531-721 is a sought-after Spring Drive piece from Seiko's golden era. With its 19mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-dd77baa8c7c7]

Also known as: Bullhead, UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Black

Jewels

23j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1991

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