It must to be a joke: two microphones "signed by" Freddie Mercury, with COA! And it seems that both COAs come from the same person.
I know it's difficult to write on a surface like that... but anyway, that's not Freddie's hand.
The first one was sold time ago for about £3800. The second one (in comments) is currently auctioned on eBay.
It's a shame.
Not for me, no. Where there is forensics a crime is not far behind.
That mic is supposed to at least 28+ years old?
At least, Eric! O_O
As far as I know, Freddie never signed a mic!