I bought this same mug at Disneyland back in the mid-nineties. I had to check it twice after reading that Snow White and the Prince were wearing ear hats in the pic above. After looking at mine, I can see that they really aren't wearing hats. It just sort of appears that way in the photo. I think there might actually be a mark (or maybe glare?) on both S.W.'s and the Prince's hair that makes it appear that they are wearing mouse ears. My mug has c. DISNEY on the bottom along with a price tag of $15.95. There was a corresponding stein sold at the same time that had the classic "Mickey Through The Years" design on it.
Thanks so much for the info Tokyo! I have updated the post to include your details. :)