The gun was originally proved 1925-1954.
It was reproved to CIP standards (the crowned R) after 2005; I can't make out the date thereof.
It carries 12g 76 mm = 3” LEAD "High performance/Superior Proof" (the 2 Crowns over SUP)
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
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