So I bought this Strat recently that was made in Japan in 1975. The pickups are heavy magnet Greco, but that's about all I know for sure. Here are pics of the neck heel, which is the only place on the guitar where there are any markings, and the neck pocket, which may once have had a micro tilt adjustment, but I'm not sure. It has four holes for the neck plate, plus one extra that is now vestigial. (and two really small ones that don't go all the way through). So I'm wondering if anyone can tell me what the markings on the neck heel mean.