Seiko Cal. 4428 - 707

The 4428-707 is a sought-after Solar piece from Seiko's golden era. Powered by the 4428 caliber with 21j jewels beating at 28,800 bph, it delivers a 70 hours power reserve. [seikata-wm-065054cf676a]

Also known as: Baby Tuna, Flighty

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

8.1mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Cream

Jewels

21j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1981

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