A rare model that was only produced for five years from 1961.
It’s a short period, but there are many types, so it’s a popular model for enthusiasts.
A notable detail is the combination of the zipper and the engraving on the back of the top button.
Button back K = GRIPPER ZIPPER
Button back S = CONMAR ZIPPER
Button back J = TALON ZIPPER
Button back W= TALON ZIPPER
It is very difficult to get all of these with the 551ZXX, which originally small in number.