I wish I had a better idea as to what it might be worth, but if only compared to other similar European and Bahamian cards of membership and entry (at least those I've had), I would say well over $100.

I had one Bahamian card sell for $120 and an Evian, France, entry card sell for $230... and even a simple programm of events at another French casino in the 1920s sell for $175.

Feel free to e-mail me should you have any questions.