Hello to everyone... I could use some help with my new early 60’s Astro-Jet please. It doesn’t have the silver plate with the serial number, but a black plastic plate that reads “Astro-jet, super filtertrons”. Has anyone know what year this guitar might be? Its hard to read the pots. It also lacks the tension bar the other Astros have. My guess that its a prototype or a very early piece. Could I be right? Thanks in advance!!!