I suppose your best place to ask would be the Canadian Club Museum as Hiram Walker were the owners.
The other point is that they were bought over by Allied Lyons in 1986 and that company more or less stopped using the HW name by the end of the 80's. For info, Peoria was the bottling plant for HW and then Allied until the company was bought over by Pernod.
So as an educated guess it would be some time earlier than the late 80's
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