team signed baseball

i've got a 1978 team and manager signed ball the big red machine cincinnati red it's and offial ball has feeney on it the top players signatures manager and coachs has signed it also i need to know what s the best way to sell and advertise it for sell est on what to ask for it i don;t know where to start .i got it at an estate sell please give me any advise that would help me get a fair deal thanks