After looking at almost every sailboat in the sail boat galley on sailing texas the closest i found was the Tangerine 18 but its not exactly like it so i looked it up on google and the are two other boats like it I think it might be a sigma 18? Let me know what you think?
It appears to be a Mirage built in Gainesville Florida in the 1970's. The Mirage was a Bruce Kelley design and was actually a pretty nice boat for its day. I went to college in Gainesville where the boats were built and visited the factory on several occasions. While this was not the highest quality builder, build quality was reasonably sound.
I don't recall them being as flat bottomed as your photos seem to suggest.