I love this button!!!
I had posted the same query a few months back, and like you I could not find a definite confirmation regarding this button! As Denis has state in his article on Treasures of Malta 55, Christmas 2012, "it's a common belief......".
However with what Denis has written and Roger's contribution I take it that it is a Mess Waiters Button till proven otherwise.
Shame to say, I haven't visited Fort Rinella as yet, maybe that's where we could find some answers to this query.
Regards.
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