I have a script cover signed by all cast members from final episode of Cheers. Does anyone know approximate value ?
The value for items like this is dictated by the market for it that exists at any point in time. Your best bet will be to find a reputable autograph auction house, consign it and see what it brings. There is no catalog value for items such as this.
Are you sure the autographs are authentic? Is there any documentation that comes with the script cover?
It was given to me by Kirstie Alley, so I would say 100% authentic
If you check eBay there is a signed photograph,not authenticated but said to be real, that went for best offer with original BIN over $200.
That's only one sale, but maybe helps you.
You should probably look into getting it authenticated since you are certain it is real. This would greatly increase interest in it. The autograph field is filled with secretary signatures and outright fakes so authentication is important if you want to get the best price.