I'm hoping this pdf will upload okay.
I've seen a lot of people on here get all excited about finding a "Featherweight" only to find out they actually have a 66 or 99 or 15 - not that there's anything wrong with those machines - they are all great but they fershure aren't Featherweights.
So I worked this up and hopefully it will help people recognize some of the various machines. I don't have a 201 or a few of the other desirable machines so didn't include them.
Print this out and take it with you when you are out looking at old machines!