Hello,
Just found this post - a little late I know! I have one of these in my shed. My Da bought it new in the early '60s. You can remove the rotovator bit and fit a grass mower. We used it for many many years - both to cut a large lawn area and to cultivate our vegetable patch. My Da removed the blue cover from the tines because stones regularly got caught there and stalled the machine! It was a heavy machine to push around the lawn - I remember as a 12 year old! There was also a hedge trimmer which attached to the other side from the above picture. I remember there being a book with it but I don't think I have it.
I haven't started it in a good many years. The mower is attached at present. I will try and get a photo at some stage.
Jim.