Seiko Cal. 0728 - 942

The 0728-942 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 0728 caliber with 20j jewels beating at 28,800 bph, it delivers a 58 hours power reserve. [seikata-wm-3c7ad4714f48]

Also known as: Tuna, Bullhead

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

13.2mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1976

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