This one would qualify as a rarity. I do see one every now and then but usually with the dark  grill cloth. The 1 x 15 was more popular with the professional musicians who could actually afford one of these very expensive top of the line amplifiers. Eventually the compact 1 x 12 Showman model was phased out around 1964. This is a nice all original example with some normal wear but still attractive and working well.