Seiko Cal. 6638 - 906

The 6638-906 is a sought-after Kinetic piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 70m of water resistance. [seikata-wm-5bf6442213eb]

Also known as: Bellmatic, Crown

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

34mm

Case Thickness

10.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1971

Related Models

• Seiko 0737-295
• Seiko 6633-417
• Seiko 5285-822
• Seiko 7152-782
• Seiko 3869-989
• Seiko 5239-167
• Seiko 5668-734
• Seiko 4596-531
• Seiko 6616-947
• Seiko 6347-547
• Seiko 6242-787
• Seiko 6655-300