Translated with Google Translate. Original text show .
The liberation from protection 1961
gem: mo Anton Heyboer (idt); lo 1/5 own print (black ink); ro Anton Heyboer 1961 (black ink
Provence Piers 61015 (according to Piers there is only 1 print)
In the etching - (mirrored): "The liberation from protection is from the green into the black.
In between is the white that keeps the two apart.
White is 4 and 8 is 2 x 2 and 4 x 2
The work is depicted in: Anton Heyboer. The graphic work 1950-1965, Part II, page 372.