Recent new pictures have brought the identity of this character into question. DIS 083 is clearly Gus, and really looks nothing like this. Speculation is that this is either another view of Jaq or possibly another mouse from Cinderella, Bert or Mert. The coat color is correct for Bert or Mert.
This new image courtesy of my friend Alfred has some hand written initials on the base, MM, which could stand for Mert Mouse. I'm willing to go with it.