That is correct, as far as Lesney-based models are concerned. That has always seemed logical, as all my cataloguing efforts were initially based on Charlie's works, which were the most comprehensive publicly available anywhere.Taniwha wrote: Er, doesn't Christian F. actually use Mack's coding system on his website?!
However, I have learned that several participants here frown upon anything created by Charlie, so I have adapted and see nothing wrong with using UK codes (as conceived by Geoffrey Leake and promoted by Ray Bush et al.) here instead. This goes along well with the fact that this site is run from the UK.
The two main differences between UK codes and Mack codes are that UK codes continue the suffix letters on from the regular wheel era whereas Charlie started over again with "A" for the first Superfast models, and that UK codes are based on the models' worldwide (or specifically European) issue numbers whereas Charlie's codes are quite naturally based on US issue numbers.
Side note: up until 1977 there was no difference between worldwide and US issue numbers; from 1978 onward differences began to emerge, as several older models were re-issued in the USA in that year and were given new numbers (initially Roman).