Seiko Cal. 6647 - 680

The 6647-680 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6647 caliber with 36j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-90895b6e36d8]

Also known as: Golden Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Black

Jewels

36j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1982

Related Models

• Seiko 5639-444
• Seiko 6134-253
• Seiko 6378-543
• Seiko 4545-714
• Seiko 5669-797
• Seiko 7188-564
• Seiko 6370-147
• Seiko 5272-723
• Seiko 7096-170
• Seiko 7041-359
• Seiko 6653-704
• Seiko 5283-332