Promotional material and Yesteryear activity was in chaos at the end of 1972 due to the suspended production while Lesney concentrated on the Superfast range. Production did not start again until September 1973 with the Y-3 Riley and then only a half plated version was released in Germany and late 1974 in the UK.
The first pocket catalogue to show actual production Yesteryears was the 1975 issue (designed, produced and printed in 1974). Up until then it was those crimped axle-end models shown in each catalogue!
It would not surprise me to find out Lesney allowed someone else to handle Yesteryear marketing at that time and Lesney did consider stopping the Yesteryears range alltogether, it was the miniatures range where the interest and money was for them!
So in retrospect they (or somebody) did well to actually get some promotional material out into the public arena, even if it contained errors
Ghosthunter.