1943 italian SIGNAL mark PROBEHEFT

[Alpenvorland]

Hello
I have found at flea market two signal from october and november 1943
and they have stamp PROBEHEFT

someone can help me to identify what mean?
they are rare? what can be the value?
kind regards

[mjfur]

Probeheft = Free copy.

Value = Free

[Alpenvorland]

thank you for the info!!