I got an SM57 off Temu for £8.50 🤣 just to see what you get. Arrived yesterday.
Looks right, but no Shure branding. Clearly less well made than a real one, but does appear to have rubber suspension (a bit firmer than the real one). Awful clip, decent bag. A xlr to unbalanced jack lead that looks like it's 1970s.
The connector was wired unbalanced, so corrected that and it works.
I have a big collection of cheap & mid price microphones. I'm thinking of a way to test them, and bexdure which are worth keeping. Possibly a cheap spectrum analyser and put them in front of a white noise source as a rough and ready approach.
Would be fun to do a Microphone Shootout.