set of 4 brutalist oak chairs

Lovely set of four dining chairs with a gorgeaous oak frame. These chairs are very solid and have been reupholstred. 
 
The chairs are from an unkown manufacturer but absolutly lovely! They were probably made in the 1970's in Belgium. 
 
 
Measurements:
Width: 46cm
Depth: 45cm
Height: 91cm
Seating height: 46cm