Vintage Selmer Clarinet 10S ( preowned )

Up for sale is this lovely Selmer 10S clarinet . It is an ex-teacher instrument and presents  well for a vintage instrument  . It has not had a recent service however it plays fine . It has been bought to our knowledge that there are 2 different serial numbers on the joints -lower joint B5306, and upper joint B5247  meaning that one was potentially replaced or changed way back when ! Not uncommon and our brass/wind teacher has played it and said it is lovely !