That is an Eversharp-Schick Type E. It is a great razor, but has a lot of bite! It's one of the most aggressive vintage razors, so be sure not to apply any pressure at all. Just let the razor do the work. I used to get cut up all of the time when first using mine, but the beast can be tamed.
They all look the same to me. How can I tell which are more/less aggressive? I have found anything here that gives relative aggressive rating of injectors like there is for DE razors.