I wonder if the foot with rollers is a leather foot? What we call teflon rollers on our modern feet, for sewing leather.
In the last month I acquired first a black 301, then a Spartan, then a 1916 Red Eye 66. i have to say that by far so far my favorite for stitches is the 301. I LOVE the sound of the Red Eye. The Spartan I'm still working with. It is the nicest looking one of the 3 as its in almost mint condition, but I think it may need some springs replaced or something. It's like I can hear them when I raise the presser foot, or something like that...and feel them. It's just not normal feeling and I don't know how else to describe it...lol
I am LOVING my machines though!
I put my Domestic away todya for awhile though. Trying to get it to work right is distracting me to much from sewing :)