This 5-string was built in 1982 by Shot Jackson, renowned Dobro/pedal steel player and founder of Sho-Bud, which manufactured mostly pedal steels and lap steels. Shortly after building this instrument, Shot retired and had a stroke, so this may well be his last electric mandolin.
     It might have been his first, too, since it's the only Sho-Bud I've seen. But reportedly, country singer Ira Louvin also built electric mandolins for Sho-Bud when he worked there in the 1960s.