Need help and opinions on autographed football

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My brother recently picked up this USC team signed football with what appears to be players spanning the 1936-39 time period. What do you think this football might be worth and what would be the best way to go about selling it? Should it be sent in for some kind of authentication? There are more than 50 signatures on the ball are there any specific signatures that we should be looking for on this ball that are exceptional?

Thanks!

Signatures identified so far are -
carl benson
dick berryman
floyd phillips
frank mattson?
phil duboski
alex atanasoff
bill fisk
phil loper
bob berryman
bill bundy
coach jones
sol (salvador ) mean
bob delauer 1940
howard stoecker
james slatter
bob hoffman
ben sohn
bob robertson
john thomassin
jack banta
al kreuger
bob peoples
billie musick 1940
frank swirles 1939