An interesting mug you picked up there. I did a search & this is all that I could find on this type of mug.STAR WARS A NEW HOPE CERAMIC MUG
Now the one in the auction has a picture in the circle of whats called the Falcon Cockpit were as yours is blank.
Maybe yours did have a picture at one time but I am not sure on it.
The auction mug is a dead ringer for the one you have. Same shape & style & even the lettering is the same.
The mug did not sell so maybe you can ask the seller a question or 2 on more of this mug.
Thats the best I can do for ya!