Schooner for a Film shooting wanted

Dear Ladies and Gentlemen,

I'm representing a German film production. They are planning a TV movie in the Caribbean
in April 2011.
For that, they are searching for an older sailing boat/ or freight boat - preferably an old schooner with
a lenght of 100 to 150 ft. - to rent for the shooting.
The story is about a modern German treasure hunter who searches for a sunken Spanish galleon.
The shooting will take place over a period of 4 weeks and the location will be the Grenadines.*The vessel will be needed for about 15 days.
The vessel should not have a pirate look, it should be a ship where the work of treasure hunting is shown authentic and believable. The "Stahlratte" or the "Princess Duda" are these vessels. You find them on google pictures.
Do you see any possibilities to facilitate such a schooner or another ship which is similar
to the one we're looking for.

It would be great to hear from you.*
Thank you in advance for your answer and help.*

Kindly regards
Graf