Seiko Cal. 6637 - 577

This Hand-Winding model from 1975 features a 38mm Two-Tone case. It features a Navy dial protected by a Hardlex crystal and offers 120m of water resistance. [seikata-wm-d2d5afaa846f]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

38mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Navy

Jewels

26j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1975

Related Models

• Seiko 5216-687
• Seiko 3811-246
• Seiko 4487-371
• Seiko 6353-459
• Seiko 4461-720
• Seiko 6644-912
• Seiko 6169-333
• Seiko 6676-955
• Seiko 6368-762
• Seiko 0750-874
• Seiko 6274-734
• Seiko 6283-227