Seiko Cal. 6657 - 661

This Hand-Winding model from 1968 features a 40mm Two-Tone case. It features a Silver dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-33dee89ea937]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

14.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Silver

Jewels

32j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1968

Related Models

• Seiko 6161-383
• Seiko 5697-942
• Seiko 6193-964
• Seiko 5632-435
• Seiko 4522-184
• Seiko 3866-930
• Seiko 6179-597
• Seiko 6160-976
• Seiko 7095-647
• Seiko 5656-976
• Seiko 0782-984
• Seiko 0737-610