Seiko Cal. 4428 - 981

Released in 1975, the Cal. 4428 with design code 981 was part of Seiko's domestic market collection. Powered by the 4428 caliber with 31j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-9e78dee4a2ca]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

41mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1975

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