Think the mistake people refer to is the sign on the chimney.
Emailed the firm a couple of times a while ago, to see if if they could clarify anything, and let us know the true history. Didn't get any replies unfortunately.
Could of course have been a very good marketing ploy!
It is after all one of the discussion points when outsiders are talking about Accy.
And over the years the company has never let us know what is legend or fact. Wonder why?