Seiko Cal. 3891 - 621

This Hand-Winding model from 1970 features a 40mm Stainless Steel case. With its 21mm lug width and 11.2mm profile, it sits comfortably on most wrists. [seikata-wm-8176dd9c3d06]

Also known as: Sportsmatic, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

11.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1970

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