Ridolpho, I think it would still be considered a firearm even in its detoriated condition so as long as you had a PAL you could own it. Seeing as the Long Gun Registry is gone the hassle of trying to register it does not exist any longer so trying to find the serial number would no longer be required.
Can you imagine before the LGR ended trying to convince someone from the CFC youi can't find the serial number as the condition of the gun makes it impossible. I had enough trouble trying to register a Lee Enfield that according to the person at the registry should have had a letter prefix which it didn't.
I would love to have a gun like that, just think of the nights you could sit before your fireplace trying to imagine the stories it could tell if it could speak, or for that matter who carried it.