The PR2 was Bogen's first component stereo preamp, and appears to have only been sold in 1960, so is very rare.   This unit was treated with a complete electronic restoration, including restuffing the 'can' capacitor, replacing the filament rectifiers with modern diodes, complete recapping, and replacement of any other out-of-spec components.   This one includes the often missing 'landing gear' legs.   It presents quite well, and sounds surprisingly good.