Seiko Cal. 7128 - 420

This Spring Drive model from 1965 features a 40mm Titanium case. With its 20mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-174a3dc2ef07]

Also known as: Sumo, Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

White

Jewels

24j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1965

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