Quoted:
Is that slide different?
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yes it a little bit from your slides.
first, Italian 9mm guns are chambered for 9x21mm because 9x19 is banned since it's in use with military and LEO.
second, that "CAT.5180" is the Italian "Numero di Catalogo". The Italian Government keeps a register of all firearms available in the country. Each single model has it's own "Numero di Catalogo" number. Therefore, all Glock 19 9x21s have number "CAT 5693", all Glock 17 9x21s have a different CAT number, etc. Of course, this code is different from the number attributed by Glock to each single pistol.
third, there are some extra marks. These marks certify that the handgun has been imported in compliance with the local applicable rules and that it has been tested at the Italian Governmental testing ground (Banco di Prova). All pistols are tested there with a few very powerful loads before being distributed to the retail dealers.