1/ I believe this is a BBb and not an Eb.
2/ This is a pretty easy (and in-tune, as I've done it) cut to CC. Very few sousaphones can be cut successfully from BBb to CC.
3/ I do not know the seller. I have not inspected this instrument. I am not offering to do nor soliciting any BBb to CC job. I will decline the job if asked.
http://www.ebay.com/itm/Buescher-Sousaphone-Eb-Old-Project-no-reserve-/261011066051

