I have a Beeman marked C1 .177, I will take a look at the markings, i think the C1 was based on the Webley and Scott Vulcan. I remember thinking it be a neat rifle when I use to droll over the Beeman Catalogs, ended up buying a R10 in 1982-3. the C1 came to me as a seized evidence gun of all things.
its almost impossible for me to look thru the iron sights with the goofy stock it has on it, I really need to lay my head down and way back on the stock....or put a scope on it.
a few years ago I picked up a pair of FWB 124, one with the nice fancy stock, other plain jane with no buttpad, both needed to be re-sealed, I bought some stuff and did it myself, they are by far my favorite air guns, I really wanted one when I was a kid, I had shot my neighbors and loved it. But the R10 was the hot new magnum air rifle and in .20, still love that gun.