Ship's bells used to be (not sure if still) held in the trophy store in Pompey. Every years there would be a sale of them announced by DCI. I know this because I used to get the DCI's to look out for any of my brother's old ships as he wants one of theirs. I am guessing a ship that old would have had the bell donated to a museum/affiliate on decommish or may well have been sold in the manner I've described.
I presume you mean the Rum Barrel not the stone jars of rumin the wicker baskets! In Gib in the early 80's there was a "wine merchant" who bought up all the stocks of pussers finest from MOD(N) held in Gib and was flogging it off at a tenner a jar ... had 2 or three off him during my time there. My only regret is I didn't keep any of the jars!
It was partaking of a jar of pusser's bubbly (in the wicker basket) that led to me spending a night as the guest of the Royal Military Police in Gibraltar on one particularly fine run ashore in the 80's. No sense of humour, those Redcap chappies.
HMS Devonshire Bell, along with the Honours Board, are at the Devon County Council offices in Exeter.
I made an appointment to view around 5 years or so ago, when in the area.
The council staff were very happy to oblige.