Seiko Cal. 4528 - 307

The 4528-307 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 11.9mm profile, it sits comfortably on most wrists. [seikata-wm-ce6ddf90a136]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

38mm

Case Thickness

11.9mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1981

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