Bob in 1958 with a 1957 Silvertone 1319.
Since we do not see the lower part of the guitar in the photo of Bob we do not know if it's a 1317 (one pick-up) or a 1319 (two pick-ups). Otherwise the two models are identical.
Silvertone was the brand name used by Sears, Roebuck and Company for its line of sound equipment from 1915 to 1972. The Silvertone name adorned guitars from several different manufacturers over the years, including Danelectro, National, Harmony, Kay andTeisco.
thanks to Andreas Volkert