I would honestly keep it as is. It tells a story.
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I agree with Ade keep it as it is,
Leave it alone. The poor thing has been fiddled with enough. Time to let it rest ............
Its a number 5. The lugs on top are different from the 36, and the top of the striker is not visible on your number 5 as they are on a number 36. Also your number 5 is not as round as the number 36.
I would leave it as it is, funky little money box.
Thanks for all the replies. I think at the moment I am going to leave it as is and keep looking for another Mills bomb that hasn't been changed at a reasonable price to add to my collection.
it could be a no5 or a 23mk1 or mk2 as the only differences was the striker and base plug .