Seiko Cal. 6643 - 577

This Hand-Winding model from 1982 features a 36mm PVD Black case. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-0d44bdb37101]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

9.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

22j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1982

Related Models

• Seiko 6244-220
• Seiko 7196-713
• Seiko 6259-339
• Seiko 6656-378
• Seiko 7055-304
• Seiko 6264-460
• Seiko 6611-373
• Seiko 4445-159
• Seiko 6669-841
• Seiko 7156-573
• Seiko 6624-540
• Seiko 6167-719