Walt Gottfredson

Here's an odd thing that I stumbled upon on eBay today:

And here's the description:
----------
You are bidding on an original art by Arthur Floyd Gottfredson (May 5, 1905 - July 22, 1986), an American cartoonist best known for his defining work on the Mickey Mouse comic strip.
Hand drawn Walt Disney logo, undated. Pen and ink on a business card size blank card.
* Size approx. 2 in x 4 in (5 cm x 10 cm)
* Condition: Superb original con
-----------
Now, I wonder why they believe that it's by Gottfredson?
First time I've seen an autograph (without art) for sale that isn't by the person whose name appears on the autograph card.
It's just such a bizarre little gem that I couldn't resist sharing it with you wether it's a Gottfredson piece or not.