its not old Cambridge AE54 LNB as there is enuff markings left on the label
but looks a lot like it almost identical i'd say it is still a Cambridge LNB of some description..... i have still got mine and its not in too bad shape either ,
but its not like a modern 0.1db or 0.2db Gain LNB therefor sadly wont be useful for very much , is like 0.6db gain as that was quite common about 30 years ago .
keep it as antique only the holder is rusted and busted the LNB itself was clearly made to last forever and likely will too