Seiko Cal. 6620 - 831

This Hand-Winding model from 1968 features a 46mm Two-Tone case. Powered by the 6620 caliber with 34j jewels beating at 21,600 bph, it delivers a 57 hours power reserve. [seikata-wm-386b7a693671]

Also known as: Silverwave, World Timer

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

46mm

Case Thickness

10.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

80m

Dial Color

Cream

Jewels

34j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1968

Related Models

• Seiko 6649-859
• Seiko 6323-569
• Seiko 4427-746
• Seiko 5655-690
• Seiko 3877-166
• Seiko 7162-165
• Seiko 6275-557
• Seiko 5270-642
• Seiko 5254-199
• Seiko 6212-209
• Seiko 4592-198
• Seiko 4552-102