Seiko Cal. 6640 - 212

Released in 1982, the Cal. 6640 with design code 212 was part of Seiko's domestic market collection. It features a Blue Sunburst dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-97cb1eaa3b51]

Also known as: Helmet, Emperor

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

8.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1982

Related Models

• Seiko 5667-185
• Seiko 6325-254
• Seiko 6175-457
• Seiko 3885-574
• Seiko 6625-518
• Seiko 6342-949
• Seiko 7085-120
• Seiko 7022-628
• Seiko 7087-160
• Seiko 5235-139
• Seiko 4485-450
• Seiko 6611-141