This was purchased years ago from Bonhams, one of the world's oldest and largest auctioneers of fine art and antiques.   We include a copy of the auction webpage from the time of the purchase and it comes with the tag from that auction. 

Because it was purchased from Bonhams, that strongly backs the authenticity and quality of this art. 
It is by Walt Disney Studios and is graphite and colored pencil (red, green) on paper. 
  
It measures approximately 15 inches X 18 in x 2 in  (Within the mat it is 10 in X 12 in)

We include a screen shot from the exact moment this appears in Disney's Tugboat Mickey. 

 
Buy with confidence: we have effectively 100% positive feedback from over two decades on eBay.

USA Seller, Ships out fast,  No tariffs on USA deliveries