Here is a model sheet of Monty with "Jack Miller" written in pencil on the lower right. Miller, Joe Grant and Bob Jones were superb artists that became the Character Model Department. I don't know if this is Jack Miller's writing or someone else indicating that the copy was to be given to Jack Miller. However, the way the letters are drawn would lead me to believe that it is Jack Miller's writing.
Jack Miller Stat Model Sheet [click to enlarge]
----- DATABASE NOTES -----
From “Country Cousin” (1936). "U.S. 37" Model sheet stat. First generation "Monty" Pencil "Jack Miller" [15"W x 12"H] Acquired 2000. SeqID-0466