Seiko Cal. 4428 - 321

This Solar model from 1971 features a 38mm Two-Tone case. Powered by the 4428 caliber with 23j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-2bf2e0deba80]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

38mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

140m

Dial Color

Navy

Jewels

23j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1971

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