Seiko Cal. 4520 - 978

The Seiko 4520-978 represents an important milestone in Seiko's 1968 lineup. With its 21mm lug width and 15.4mm profile, it sits comfortably on most wrists. [seikata-wm-9cdd435bf8ea]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.4mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

White

Jewels

17j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1968

Related Models

• Seiko 7149-893
• Seiko 0795-304
• Seiko 4524-201
• Seiko 5692-655
• Seiko 6287-552
• Seiko 6288-240
• Seiko 7113-859
• Seiko 5664-706
• Seiko 0768-826
• Seiko 4466-193
• Seiko 6634-757
• Seiko 5220-370