I have a couple of Squiers and I have no idea if they're VM, CV, Affinity, or what models. Any way to tell the difference? I'm just on a low-key mission to figure out exactly what my basses are. The fretless jazz is brand new and came with Seymore Duncan pick ups. I have no idea what year the '51 Precision is and the previous owner changed out the neck... Any help/tips great appreciated!