Seiko Cal. 6638 - 678

The Seiko 6638-678 represents an important milestone in Seiko's 1980 lineup. It features a Champagne dial protected by a Hardlex crystal and offers 180m of water resistance. [seikata-wm-8fac0eec4d26]

Also known as: Monster, Arnie

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

12.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Champagne

Jewels

32j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1980

Related Models

• Seiko 4554-945
• Seiko 4536-531
• Seiko 6673-157
• Seiko 6240-688
• Seiko 5235-228
• Seiko 0773-351
• Seiko 7086-454
• Seiko 0742-916
• Seiko 4511-727
• Seiko 7029-551
• Seiko 7112-172
• Seiko 0754-579