Seiko Cal. 4521 - 520

The Seiko 4521-520 represents an important milestone in Seiko's 1977 lineup. It features a Navy dial protected by a Sapphire crystal and offers 130m of water resistance. [seikata-wm-b156f79b503c]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

9.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

130m

Dial Color

Navy

Jewels

21j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1977

Related Models

• Seiko 4452-676
• Seiko 0794-631
• Seiko 7181-937
• Seiko 0746-391
• Seiko 7092-370
• Seiko 4552-895
• Seiko 6290-529
• Seiko 6278-677
• Seiko 6151-599
• Seiko 7053-325
• Seiko 3887-255
• Seiko 4485-841