Seiko Cal. 4491 - 721

This Quartz model from 1968 features a 36mm PVD Black case. With its 20mm lug width and 14.4mm profile, it sits comfortably on most wrists. [seikata-wm-4e001347afb6]

Also known as: Helmet, Emperor

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Black

Jewels

36j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1968

Related Models

• Seiko 0710-773
• Seiko 4596-132
• Seiko 6655-253
• Seiko 6655-660
• Seiko 0792-391
• Seiko 6397-299
• Seiko 6350-672
• Seiko 0742-708
• Seiko 6345-371
• Seiko 6115-312
• Seiko 6164-334
• Seiko 4476-689