Seiko Cal. 6620 - 645

This Solar model from 1978 features a 37mm Stainless Steel case. With its 20mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-236000acd4f4]

Also known as: Tuna, Crown

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.9mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Green

Jewels

30j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1978

Related Models

• Seiko 5237-395
• Seiko 6296-306
• Seiko 6637-597
• Seiko 4552-874
• Seiko 5645-158
• Seiko 3885-804
• Seiko 7064-471
• Seiko 6368-812
• Seiko 4511-419
• Seiko 5692-179
• Seiko 4479-285
• Seiko 5652-395