The photo on the left from 1910 shows Montgomery and Stone in The Old Town, one of the shows that followed Oz. After Montgomery's death in 1917, Stone declared he would not seek a new partner, and he became a solo performer - although there were rumors of his teaming with Frank Moore (an interesting Oz connection, since Moore had starred as the Shaggy Man in The Tik-Tok Man of Oz). In later years he often paired up with one or another of his three daughters - Carol, Paula, and - Dorothy!
Throughout his life, Fred Stone kept a connection to his famous Scarecrow - he often signed autographs with his own caricature of the character. Although the example below bears the date of 1902, that simply commemorates the start of his years playing the role - this is from the endpaper of his autobiography, published in 1945. Something to be aware of, should a loose page with an early dated autograph turn up!