 DATE: Hyde pictures Chrissy standing with two guitars  (Stratocasters) strapped around her. The guitars have locking  tremolos indicated by the bolts on the back of the necks. The  episode takes place in 77, but locking tremolos werent invented  until around 79. The Stratocasters also have the original headstock  design. During 77, Fender was owned by CBS and featured the larger  "CBS design" headstock.