Seiko Cal. 5638 - 670

Seiko 5638-670

The Seiko 5638-670 represents an important milestone in Seiko's 1968 lineup. The Inner Rotating bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-049498122e4c]

Also known as: Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
43mm
Case Thickness
15.8mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
110m
Dial Color
Champagne
Jewels
18j
Frequency
36,000 bph
Power Reserve
36 hours
Year
1968

Related Models

seikata-wm-049498122e4c