Seiko Cal. 6657 - 968

Released in 1978, the Cal. 6657 with design code 968 was part of Seiko's domestic market collection. With its 20mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-dabcf0ae97b1]

Also known as: Tuna, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

37mm

Case Thickness

10.7mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1978

Related Models

• Seiko 4410-554
• Seiko 6325-426
• Seiko 6614-164
• Seiko 5277-929
• Seiko 5291-391
• Seiko 0714-554
• Seiko 0711-481
• Seiko 7068-815
• Seiko 4554-590
• Seiko 4461-171
• Seiko 6349-640
• Seiko 7088-453