The only markings on the SA80 bayonets were on those manufactured during the trials period and the 85/86 batches which were serially numbered. However, the serial numbers were not to a rifle, just a number for control purposes on the bayonet.
Anyone out there got a serially numbered one to show the bandit?
I did manage to match one up VERY closely with a rifle by serial number once. I think it was UE86A00868 and bayonet 86/886
BUT there is something that you should be aware of. It was permitted for security reasons, for units to mark a 'rack' number in what we called 'scratchy-pen' (a sort of vibro pencil) or an electric pencil on a flat surface close to the spring loaded catch. We were not permitted to stamp or punch the number in case it dented or cracked the steel - or blunted the marker stamps! So if you see a number there, you know that it has been 'liberated' by some means....... There, another useless bit of Enfield info that not a lot of people know about!