ROY, Marvyn (1925 – 2020). 500-Watt Bulb Signed by “Mr. Electric." A Champion 120-volt 500-watt bulb SIGNED on the surface, “Sincerely / Mr. Electric / 1993" with a drawing of a lightbulb beneath the autograph. Length 6 ¾". Marvyn Roy and Carol presented their world-famous Mr. Electric act in Cincinnati as part of the Playhouse in the Park Abracadabra show in the 1990s and presented this signed bulb to the Salon de Magie at that time.