Seiko Cal. 6643 - 920

The 6643-920 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6643 caliber with 36j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-46d60ff44b64]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

44mm

Case Thickness

12.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

36j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1986

Related Models

• Seiko 7076-817
• Seiko 5260-148
• Seiko 6335-922
• Seiko 5647-490
• Seiko 3813-914
• Seiko 5671-166
• Seiko 5244-403
• Seiko 5240-877
• Seiko 3878-220
• Seiko 3897-596
• Seiko 6235-458
• Seiko 3837-795