I found this fabulous 1989 pic of William Tarmey, having a quick cuppa between exterior set Corrie takes, in the second edition of The Street magazine.
A Coronation Street resident since 1983, when Bill was given a permanent contract, Jack had been slowly established by the show's production team beforehand as an intermittent character.
This "intermittent" suddenly and unexpectedly boomed in popularity in 1983 with the glorious Vince St Clair story-line.
And shortly after that, Mr Duckworth landed the keys to No 9 Coronation Street.
They were richly deserved.
Our Jack is pure Street gold.