Seiko Cal. 6690 - 320

Released in 1970, the Cal. 6690 with design code 320 was part of Seiko's domestic market collection. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-3f721ce199ae]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

9.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

120m

Dial Color

Champagne

Jewels

28j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1970

Related Models

• Seiko 6334-148
• Seiko 5688-364
• Seiko 5635-762
• Seiko 4584-601
• Seiko 7157-546
• Seiko 7125-964
• Seiko 7124-361
• Seiko 4576-822
• Seiko 3885-891
• Seiko 6666-738
• Seiko 3867-415
• Seiko 7129-580