some things identifying a Butterfly- two piece mast fairly far forward, Large main, no jib. Little wood hand rails in foot well, below deck level. Swing-up rudder with a round hinge that is about the size of a hockey puck. My rudder was flat aluminum, with no foil at all. Super simple main sheet, that has a couple small plastic pulleys that look to cheap to be on a boat. Sheet metal shroud adjusters that are not threaded but rather you just change the pin location. And of course a butterfly on the sail.