Whilst I am sure such conversions were probably period done, it is the sort of item that enterprising fakers produce to enhance the value of crappy old tins etc and fake insignia.
In this case, it might be real, though always remember to buy the item and not the story.
I hope it really did come from the son of a vet and was his dads from back in the day.
Whatever its just an opinion.
wait a minute it seems to be that rare zink cap eagle from unknown maker
Likely a personalized piece and not a production item.
LIFE'S LOSERS NEVER LEARN FROM THE ERROR OF THEIR WAYS.
Agreed. Almost certainly a hand made "trench art style" of modification. Done in what time frame? Impossible to know for sure. I wonder what was originally on the lid before the eagle was added.
"Much that once was, is lost. For none now live who remember it."
Looks good to me, I just saw a WW1 style trench art piece similar, for tobacco that still had some scraps in it.