Seiko Cal. 6638 - 545

This Spring Drive model from 1974 features a 41mm Stainless Steel case. With its 21mm lug width and 8.9mm profile, it sits comfortably on most wrists. [seikata-wm-dc5a2249f54f]

Also known as: Sumo, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1974

Related Models

• Seiko 7085-889
• Seiko 6630-708
• Seiko 7196-134
• Seiko 5648-416
• Seiko 3826-572
• Seiko 4457-626
• Seiko 5279-876
• Seiko 6671-250
• Seiko 6354-325
• Seiko 6281-444
• Seiko 7167-206
• Seiko 6355-421