Wow, there are a lot of different ways to tell if it is fake or not...some contradictory.
Although I am selling two mics, I have four total in my house right now. I can't speak to which was bought when, but I can say that the last time I bought an SM57 was in 2008 and it was used at that time (from a member of this forum). Two of the mics that I have would have been bought brand new almost twelve years ago (for my church). Again, I am not sure which mic is which in relation to when I (or my church) bought them, but all four of them look identical in every single way. I say all this, because I know that two of the mics I have must be genuine
Shure Sm57 mics.
All my SM57 mics have the correct XLR arrangement, gasket type thing under the grille, Correct color wiring both from the grille to the transformer and from the transformer to the XLR, stamped with some red letters under the circuit board, don't seem to be excess handling noise, don't feedback easily. Pins 2 & 3 give approximately 20 OHMs whereas various sites say this would be 600 OHMS if it was fake. Lettering and color all seem good.
My SM57's have an indent around the XLR which people have said means it is fake. However, all of my SM57's have this
To me, it seems that all of this point to them being genuine shure mics, especially in light of there being absolutely no difference between the four I have (which I am fairly positive two were bought from a Shure Dealer)
Do others agree with my assessment or am I missing something. Even if I don't end up selling one or both of these on this forum, I want to know what I have in case I sell to a friend or someone else.