I found a SIlverface Fender Princeton Reverb from 1979 and wanted to know what the street price shold be (its at a music store versus Ebay). Its an amazingly toneful amp for clean blues, classic Fender tone from that model amp. It has the boost knob which means late 70s and the logo change, but the cab appears to be nearly unmolested and from my brief inspection the speaker and everything else looks original. No oxidation on the silverface panel either- looks great. What's the value? They are asking $750, tagged at $800. That seems high to me... Did they change much in the circuit from blackface to early to late silverfaces for the Princeton Reverbs? I know the boost switch is a less than desirable thing, but in the normal mode the amp sounds nice for what it is.