Seiko Cal. 4428 - 340

This Spring Drive model from 1969 features a 40mm Two-Tone case. It features a Champagne dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-d228fa790fcc]

Also known as: Sportsmatic, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Champagne

Jewels

30j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1969

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