Superfly (Fortified) Wine Bottle?

This is a bottle found while on a walk in the woods. I believe it's from the 60's or 70's. It features an image of a fly below the neck of the bottle. Not pictured is a green plastic screw top that tapers toward the top.

I'm trying to figure out exactly what type of alcohol went into the thing. My dad seems to recall a fortified wine that existed in the 60's or 70's called Superfly. Any information would be greatly appreciated.