Seiko Cal. 6637 - 688

This Hand-Winding model from 1968 features a 45mm Two-Tone case. The Bidirectional bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-eb2fe8d092c7]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

45mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Burgundy

Jewels

22j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1968

Related Models

• Seiko 0777-578
• Seiko 6691-111
• Seiko 6259-485
• Seiko 7056-444
• Seiko 5287-465
• Seiko 5652-866
• Seiko 6271-942
• Seiko 6146-189
• Seiko 6372-870
• Seiko 5298-339
• Seiko 6186-845
• Seiko 7199-834