Seiko Cal. 6636 - 640

This Quartz model from 1975 features a 41mm Two-Tone case. With its 19mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-c79ba7a5b1ac]

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

41mm

Case Thickness

13.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Burgundy

Jewels

24j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1975

Related Models

• Seiko 5231-666
• Seiko 6113-265
• Seiko 5220-873
• Seiko 5266-206
• Seiko 6355-497
• Seiko 7160-431
• Seiko 6343-839
• Seiko 7121-155
• Seiko 5618-433
• Seiko 6331-124
• Seiko 4558-770
• Seiko 6615-889