I have a Catalina 27 with a hull number CAB702091075. All the hull decoders I have seen start with the prefix CYT . If it weren't for the fact that the number appears to be molded into the hull in two places I would guess that some one had changed it. The boat had been stolen I bought it at a sheriffs auction so that could be a possibility. Any help in finding the model year would be greatly appreciated.