It is a socket bayonet for a carbine, definitely not for the Short Land Pattern Musket - the socket bayonet for that has a 4" socket of larger diameter and a 17" blade. There are a number of carbines that this might be for, and the Elliot is one of those; most Carbine bayonets remained largely unidentified as to exactly which arm they were for. I inspected quite a number of almost identical socket bayonets at the Royal Armouries earlier this year, all were unidentified. The D 9 is indeed D Company or Troop, carbine number 9 within that Company or Troop.
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