Hi,
I've had the misfortune to buy a couple of fakes in the past so I'd like to add a couple of extra things that might be worth checking.
Both mic's were different with respect to where the transformer should be.
Both had a crumpled piece of paper shoved in at the connector end which when removed was a bit of a Chinese music paper. (dead giveaway)
None of these mic's came with transformers which can be easily checked with an ohmeter ie you shouldn't have any continuity between the connector pins and the capsule.
On one of the mics they'd even gone as far as encapsulating a transformer bobbin in the glue, so visually it looked like there was one in there. Trouble was there were no windings on it!
After all said and done these mic's aren't bad for what I paid for them, why they had to dress them up as 57's when they could have sold them legit....etc etc.
I probably won't be buying any more off of Ebay but at least now I know how to spot them.
Caveat emptor
Midibob