Seiko Cal. 4428 - 738

This Hand-Winding model from 1986 features a 40mm Stainless Steel case. Powered by the 4428 caliber with 23j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-249a54cffc0a]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

15.0mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

White

Jewels

23j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1986

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