That is one of the nicest ones I've seen. i'm guessing it isn't on the website because probably 40 years older than the internet. the mounting is cast so you can probably mount it any way you wish, but you will want to run your hose over those nice rollers and I can't see if they are on all four sides.
also looks like your previous owner put a new hose and new brass fittings on it. just curious what you paid for something that nice?
if you can post a picture on the thread instead of the link it will stay with the thread for years even if you change online picture services for others to know what we are talking about. I would have saved it to my laptop and put up a Photobucket big picture, but couldn't save your picture.