"The 400 series Combos were slab-bodied guitars with gold metal pickguards and a single-coil Toaster Top pickup in the bridge position. This example also has a toaster-top pickup in the neck position, as indicated by the 50 in the model number. From 1954 through 1957, the Combo was the predominant Rickenbacker electric guitar offering and came in Cloverfield Green (shown) as well as turquoise, white, blonde, natural, and black."
