T206 backstamp on pink chase
 

I recently purchased a T206 psa2 Chase with pink background that had been stamped with the name Arthur B. Gandy. I was just wondering if this is a common back stamp and if anyone had info on Gandy. I also noticed that psa did not even realize that the card had been stamped before encapsulating as it was not designated with a MK qualifier.

Here's the front

I think I have heard about this stamp before but cannot recall where I heard it.