A set of 4 iconic made in Denmark Arne Jacobsen for Fritz Hansen chairs. 
In this set of 4 there are 2 model 3207 with arm rests and 2 model 3107 without. 
Dated and marked on the base 1963/1964. 
This is a very early set of “7” chairs as they are nick named. 
They are close to 60 years old and are in great condition with age related wear and patina. 
This means that there is some pitting to the chrome and the molded ply is not as stiff as it once was. 
But the icing on the cake is that they have been completely refurbished in Classic Soft Calvados leather. 
It would be very difficult to find a nicer set from this early in the production of this chair.