Up for auction is this previously loved Bach 5G large shank trombone mouthpiece.  Rim has a few scratches, cup is very nice.  Backbone is straight and true with no signs of any damage.  This is a very popular model and will be useable in concert band or symphony orchestra.  Polish it up or play it as is and you'll have a nice mouthpiece for years to come at a bargain price!  I'm using a Schilke 52 now so I don't need this one.  Enjoy!