I'm thinkin' the Proof Houses just enjoy messing with we clueless Colonials, and I should probably stop trying frown

Original London Proof, with 20 in a diamond. Then Birmingham Proof with a 1967 date code; at 3 TONS = 8,960 psi = 618 BAR "Highest Mean Service Pressure"

[Linked Image from photos.smugmug.com]



Thanks gunman "The oval with the JF/S will be the company who sleeved the gun."

[Linked Image from photos.smugmug.com]