Seiko Cal. 6640 - 422

The 6640-422 is a sought-after Solar piece from Seiko's golden era. With its 18mm lug width and 11.5mm profile, it sits comfortably on most wrists. [seikata-wm-4757bde14faf]

Also known as: Crown

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Burgundy

Jewels

26j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1980

Related Models

• Seiko 0740-961
• Seiko 7118-666
• Seiko 6682-751
• Seiko 6640-401
• Seiko 6168-234
• Seiko 3878-369
• Seiko 6370-188
• Seiko 6379-958
• Seiko 6124-295
• Seiko 7140-667
• Seiko 6227-211
• Seiko 5262-405