Big Red Machine Autographed ball value?

Hi I have an autographed baseball by the 9 players at a game in 1975. The autographs are of.

1) Tony Perez
2) Johnny Bench
3)Sparky Anderson
4)Pete Rose
5)Dave Concepcion
6)Dan Driesson
7)Cesar Geronimo
8)Clay Carroll
9)unknown

Does anyone have a ballpark of what this ball would be worth if it is not authenticatd?Or it's value if I get it authenticated? Thanks for any help.

Dusty