SF Guarneri Homage "What tweeter do they use?"

I have heard people say that the Sonus Faber Guarneri Homage uses the Dynaudio Esotar tweeter. I have also heard people say that it uses a Custom Scanspeak tweeter. Which one is it? How do you know for sure? I would like to hear from those who know for sure. thanks
I would too!
I believe it uses the Esotar- the same tweeter used in the Extrema. When the Guarneri came out the Extrema was still in production- the Esotar is a driver that Franco Serblin had some experience with.
It is a Dynaudio driver that has been custom modified with a pear wood sphere attached to the back of the frame/magnet assembly.