The easiest way, John, would be to ask the person you bought it from. If it's s/n #4507 there won't be many (if any) official mods. 73 de David G4DMP In a recent message, John Reilly <ReillyJF at comcast.net> wrote ... >I just purchased a used K2 (s/n 4507). When It arrives, how can I tell >which mods and revisions have been installed? > - John, WØJFR