The more I look at this thing I'm thinking it's an embroidery machine because of the flat base going to the back of it. The machine is set sideways where we see only the dies but that flat base looks very much like what you would find on an embroidery machine if you turned it facing us and the dials be on the side.
Suppose it could still be some type of serger but have never seen a serger that has that flat base like that.