Seiko Cal. 5284 - 739

The 5284-739 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5284 caliber with 24j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-f6ed275b0f8b]

Also known as: Bullhead, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

44mm

Case Thickness

12.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1970

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