In order to obtain a certificate of cataloguing and authenticity for a work by Guttuso one must apply to:

Associazione Archivi Guttuso
Piazza del Grillo, 5
I-00184 Rome, Italy
tel/fax +39066788461, e-mail: archivi@guttuso.com.

sending the following documentation:

The charge for filing expenses is as follows:
drawings and mixed techniques € 350,00 VAT included
oil paintings € 600,00 VAT included.