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The Martin 0-17 1944 guitar comes with a letter of authenticity from Presley's wardrobe manager Richard Davis. Davis noted Elvis also used the guitar as a "Movie Prop Guitar" to promote the film.
Davis stated Presley kept the guitar in California and played it at home. When Elvis moved to Memphis in 1968, he asked Davis to drive his Rolls Royce filled with personal belongings, including guitars, back to Graceland. After Presley's death in 1977, Davis and Elvis' father Vernon Presley helped organize the rock star's clothing at Graceland. At that point, Vernon gave Davis the "1944 Martin 0-17 Guitar serial number 87112.''
(Source: Broadway World)