1929 greycup winning footbal

i have a 1929 greycup autographed football that has been passed down from my great grandfather , i was just wondering how much it is worth if anyone knows, even though it is priceless becasue it has sentamental value, i would like to know what it is worth around so i can tell my father.

It doesnt really have a dollar value, it's worth is probably what you'd sell it for but with you saying it's pricless....that makes it priceless.
(if that makes sense)
If the autos are clear and the ball in reasonably decent shape you'd get anywhere from 250 - 400 US on Ebay, but collectors do like their balls to be in good shape.