The original Italian Neapolitan Mastiff Standard was written in 1946, rewritten, then modified and rewritten again. It is known as the official ENCI version of the Neapolitan Mastiff Standard. The Neapolitan Mastiff is regulated in Italy by its national breed club, known as SAMN (Societa Amatori del Mastino Napoletano). SAMN is in turn regulated by the Italian Kennel Club known as ENCI (Ente Nazionale della Cinofilia Italiana). This national kennel club is regulated by the FCI. The only official worldwide standard for the Neapolitan Mastiff is the FCI standard as submitted by ENCI which in turn should get the standard from SAMN.
The FCI states that the standard for a breed belongs to the country of origin of that breed. The standard of the Neapolitan Mastiff has a rather complicated ongoing history. The original standard, written in 1946 by several of the early Mastino lovers, was rather brief. In 1949, Scanziani and others elaborated on the standard previously engineered by Dr. Soldati and due to their efforts, ENCI accepted the new breed standard. The 1946 ENCI standard remained in force until 1968. At that time the SAMN created a longer more explicit standard which was not accepted by ENCI. They contracted another individual to draft a Neapolitan Mastiff standard in 1968. This standard was adopted by the FCI in 1971. In 1987 the FCI decided that the standards for all their recognized breeds should be revised into a specific format. The standard was changed again and was accepted by ENCI and by the FCI in 1991. Bewteen 1989 and 1991 the Italian standard was translated into French, German, Spanish and finally English. If you go to ENCI's Web site you will find the standards worded in the five languages. I am advised that the Standard written in Italian differs considerably in its wording but not necessarily in its overall meaning, from the standards in the other four languages.