If they have plastic screws, I'm going to place my money on that they are the newer style Free/New Home type. And that would be with the four slot ruffler also. If they are VS - they will have a long plate for shirring, and I also bet they are not VS - but rotary, so they'll have
BTW - did they come in a cardboard box instead of a metal tin?
Most of what I have are older than the vintage where Greist started putting them in cardboard boxes.