Italy is a member of CIP, but according to Gerhard Wirnsberger, “The Standard Directory of Proof Marks” in 1962 established Standard Proof at 12,801 psi (probably by LUP/crushers) indicated by a ‘star over PSF’ AND “Superior Proof” at 17,637 psi, with ‘2 stars over PSF’ marks.
“Superior Proof” is mandatory for chambers longer than 70mm = 2 3/4”.
Great Britain adopted the 1969 Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives standards March 1, 1980.
BAR however was not introduced until 1989, and the imperial proof marks could be requested from 1984 to 1989 using the Tons SERVICE pressure while the metric version used the Kg PROOF pressure.
