1/24 means the barrels were proofed january 1924...
the rest of the stamps on the barrels are of little significance...
except for the world nitro, which is confirmation that the barrels were proofed with high pressure smokeless powder...
and not low pressure black powder...
plus, the Krupp steel stamps on the barrels indicate that the barrels will typically withstand up to five times the typical proof pressure...
I read somewhere that under destructive testing Krupp barrels began to bulge at around 90,000 psi...
the following thread on the subject is worth reading...
https://www.trapshooters.com/threads/how-much-lup-does-it-actually-take-to-blow-up-a-gun.935617/
