I'm further reviving this topic (do tell me to be quiet, but now rather excited with a car in my garage!). I procured a greyhound mascot from Lejeune and, being based nearby, went to pick it up from the proprietor. Very interesting chap and story of the firm, and he had an old ledger, which shows that AC bought their first mascots from Lejeune in June and July 1929 (see photo attached). He couldn't say for sure that it was the greyhound, but I've bought one anyway. It looks like a sample may have been purchased in June and a bigger order in July. Doesn't sound like much money though, even taking inflation into account. I thought interesting nonetheless.