I would suggest you use ebay as a good resource in pricing bottles. Search for vintage Mitsouko and see what similar bottles sell for.
I have this exact bottle full of vintage Mitsouko extrait, and as I recall, I paid around 70 euros for it. I felt that a fair price, though full, many have paid more.
As others have suggested, it has little value in the condition you've found it, except to perhaps a collector who would like to flesh out their collection. Even if it had some original perfume in it, it would make it more desirable.