Seiko Cal. 6640 - 136

The 6640-136 is a sought-after Automatic piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-33e3a2318fd7]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

10.2mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

60m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1980

Related Models

• Seiko 5265-907
• Seiko 6612-398
• Seiko 6650-208
• Seiko 0792-714
• Seiko 6124-807
• Seiko 7057-889
• Seiko 4478-859
• Seiko 4463-761
• Seiko 6654-206
• Seiko 6670-502
• Seiko 6673-867
• Seiko 5244-557