It's complicated
Italy is a member of CIP, but in 1962 established "Standard Proof" at 12,801 psi (probably by LUP/crushers so + 10 - 14%) indicated by a single ‘star over PSF’ AND “Superior Proof” at 17,637 psi, with ‘2 stars over PSF’ marks.
CIP 12g standard proof Maximum Average (SERVICE) Pressure 740 BAR = 10,733 psi; Maximum Statistical Individual Pressure 850 BAR = 12,328 psi
Mean proof pressure 930 BAR = 13,489 psi
Superior Proof is Maximum Average (Service) Pressure 1050 BAR = 15,229 psi; Maximum Statistical Individual Pressure 1200 BAR = 17,405 psi
Magnum proof 1320 BAR = 19,145 psi
Short version is that the max. service/using load pressure for the gun should be about 11,000 psi
