Kid Montana was created at Charlton by Paul Masulli and Rocke Mastroserio back in 1957. I guess Pat Morisi felt that 13 years on the trail should age a guy, because he gave "Kid" Montana graying temples for this story from 1970.
I often wonder why "Kid" is such a common gunfighter monniker. Even in reality, ther was Billy The Kid, The Cherokee Kid, The Apache Kid and The Sundance Kid.
Anyway, here's Kid Montana in "King of Stolen Valley" from Outlaws of the West #81, May 1970.