a Prodelin?
I think you've found a 6-foot (1.8 meter) Prodelin offset Ku two-way dish.
Here are some pictures I took of such a dish,
bolted to the side of a drug store.
There are many more pictures and discussions of this dish, if it is the same as what you've found.
Whether or not you should go for it, would take quite a long discussion.
Obviously it's difficult to remove.
Then, there is the $50 price.
It's really bigger than necessary for most Ku usage.
And for C-band, well, you should read what others with that dish have said.
To give a hint, I'd say it might be a little on the small side.
And, you'd want a conical scalar for C-band, too.