This is a vintage 1966 Hornby Skewes Shatterbox electric guitar fuzz & boost effects pedal. With a seemingly mythical pedigree, the Shatterbox is the glorious marriage between the Hornby Skewes Zonk Machine fuzz pedal and the corresponding Hornby Skewes Treble Booster unit. With the ability to engage each separately, the unit is effectively two amazing effects in a singular unit. However great the two are individually pails in comparison to when both are utilized in conjunction, and it is clear that this pedal was designed to work best when both effects are engaged. Recently reissued by JMI Ltd., it is rather unlikey you will ever find another original.