Sewing machine

Does anyone know if an old Necchi sewing machine is worth anything in terms of antique value? Apparently it is a good machine and still goes; I have not got around to even threading it. It is obscenely heavy, very old, and apparently does not do zigzag stitch (although I believe it does go backwards, really not sure).

If it doesn't have antique value then it will be free to the first collector, but I want to make sure first that it isn't something that might fetch me £50 or so.