I've finally taken the plunge and got myself a CB750 Sandcast.
It was Bought from a dealer here in Blighty who imports bikes from America proberly by the container load! The enclosed pics of the bike show that there are a number of parts not Sandcast, exhaust, mirrors, front fender, ignition switch etc etc, my plan is to change/find these parts over the years. The engine No.1001291 and frame No.1001206 is/was on your sandcast list.
The CB750 will share an already crowded garage with a number of bikes, one a 1968/69 Trident T150T.
Love your very informative website, roll on Summer!