Seiko Cal. 6638 - 313

The Seiko 6638-313 represents an important milestone in Seiko's 1977 lineup. Powered by the 6638 caliber with 17j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-62bc3e7cedc6]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

14.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

60m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1977

Related Models

• Seiko 6670-474
• Seiko 3824-133
• Seiko 4462-534
• Seiko 0718-106
• Seiko 4451-948
• Seiko 5617-214
• Seiko 4485-886
• Seiko 6160-527
• Seiko 6280-733
• Seiko 5694-345
• Seiko 6187-250
• Seiko 7079-882