Really heavy brass lighthouse.

I believe it is a lamp, 1920s ish found at a flea market. It is brass, about 10 pounds and cast. There is no socket. The greenish verdigris is due to the prior owner using it as yard art. I think it is an awesome piece considering the low low price. I would like to know anything about it you have to offer and return it close to what it was, leaving the patina.