Foro de Filatelia Argentina

Some examples:

1969 Gandhi:




Asymmetrical paper wire structure - with twill-binding or "rayado" - where it comes from:

1970 Hölderlin:




Linenbinding at the left - symmetrical paper wire structure.

Linenbinding where it comes from:

1964 Calvin:




At the left a twill-binding (asymmetrical), at the right a linenbinding (symmetrical).