Old Instruments SALE ! I also offer used instruments for sale.If you buy one of my instruments, a trade-in of your old instrument is possible.The old instruments are perfectly reconditioned and ready to play.Auditions are also possible for old instruments at any time. Pöllmann5-strings 1964 Used double bass4-Strings 1930 Johannes Rubner5-strings 1968 - 1 Johannes Rubner5-strings 1968 - 2 Otto Rubner 5-String 1966 SOLD