Can some of you Fender cognoscenti offer insight onto the transition finishes of the earliest Fender Precisions? I had always thought first-generation Ps were finished blond with a black pickguard and second-gens were two-toned sunburst with a white guard, but apparently the changeover was not abrupt and there are some blond 54s and 55s. Can anybody fill in the blanks and give the rest of the story? The internet is adequate on images but lacking in text. Thanks in advance.