The only proofs of stamps are color proofs of several stamps (not applied on the souvenir sheet). 

The only stamp proofs known are the the stamps with the three values of 1-cordoba, 2-cordoba and 10-cordoba.

Strictly speaking are these not only color proofs but also value proofs: you can notice the  proofs without a line under the double 00 of the value and which has been applied to the final version.

1-cordoba version (the 1st stamp is the same issues color as the issued stamp of 25cts but the value is different)

2-cordoba version:

The same but with sheet border:

10-cordoba version:

The same but with sheet border: