Hello,
This will be a bit of a difficult thing to find, unfortunately. There were hundreds of hatters and many of the logos used had no real significance, they were just fancy logos that made the hatter appear more successful or important. Many, as yours does, were designed to resemble a Royal coat of arms, giving the impression that the hatter made hats for royalty.
I wish I could help you more. You could try the Fedora Lounge for some leads.