OK, OK, OK!!!! Per Mark Chirnside, and Michail Michailikis (and I hope he does not mind me reposting his reply off the Britannic forum instead of writing it 3rd hand here, and me taking the credit), here is what he had to say.
"Per my notes, the base of one of the telegraphs went to a museum at Monaco. The sextant, bearing Britannic's name, was 'carefully cleaned and placed in the Greek museum in Athens.' I know that the brass wheel ring was raised, as was one of the ship's bells, but I haven't got any notes suggesting what happened to them. Michail may have further information, and if I recall he gave me some of that above -- including the info. on the sextant. I am grateful to him for that."
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Me too!

Maybe we all could beg Michail to go and get some pictures for us!