I found my original invoice. Rip van Winkle's past is slowly coming back to him! My kit was purchased in 1978 and looking at the piston stampings I assume the date of manufacture would be 1976 at the earliest as that looks like when the pistons were made in Italy and the eventually shipped to Paul Dunstall for inclusion in my kit bought here in Canada in 78. Here is some info on the pistons.
RennieK the number 76 on top of the piston is not the date of manufacture but the size of the piston (76mm bore) :idea: