Seiko Cal. 6638 - 993

The 6638-993 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6638 caliber with 34j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-5f1bb3ea8d7d]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

15.3mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Champagne

Jewels

34j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1984

Related Models

• Seiko 6218-878
• Seiko 0777-966
• Seiko 4472-944
• Seiko 0762-200
• Seiko 6265-342
• Seiko 5219-560
• Seiko 7045-960
• Seiko 4589-474
• Seiko 7175-233
• Seiko 5610-656
• Seiko 6620-175
• Seiko 0711-103