hi - welcome to the GMB. must admit the marks you mention mean nothing to me, but might of course to others, though I think just out of interest if nothing else people will want to see a picture of your jar please, though appreciate everyone probably knows what a Kilner jar looks like.
I seem to recall that we've had chats on Kilner jars some time in the past though unfortunately I now can't find them - perhaps one of the Mods. will be able to add a link for you.
Have you tried any of the bottle forums - always possible they will have useful information.