When I had my dad's approx 100 year old violin (it was hand selected by his teacher second hand when dad was a young lad) done up, the guy traded 2 spare bows which my brother had bought, as payment for rehairing & straightening/fixing the old original bow. He said he would offer to buy it for an interesting price that would buy several 'student grade' modern bows, but that he would advise me that I really should keep it!