@Marko57 Do you have any photos of the burner? It looks like the SwiftLite burner. I have a Handi configured like this that has the SwiftLite tag on the collar. See here.
@Nils Stephenson Hello Nils Yes, my 2 lanterns shown here have the old Swiftlite burners fitted in them. I did check out your blue hood lantern in the link above and it has many things wrong with it. Hood nut, handle, sprit cup, filler cap. Someone has done work on it, You ????? @Julian Whittaker has the right brass tag on his lantern. I was sent the pic below by Denis Huges the grandson of the original Handi owner.
Apart from a bit of a clean, the lamp is as I received it. I do know the parts you mention are wrong, but it is not normal for a collar to be swapped around, but there are never any guarantees if there is no documented history. I had been led to believe that the first KeroPet is your no. 2. I got the info from Albert who got it from Dennis. Maybe there was a transition period where parts were used up and there was a mixture of combinations. The customer of the time wouldn't have cared what it was called as long as it worked. It's only us collectors that get caught up in the little details.