Here’s an ad from the October 1 1928 edition of the Toronto Daily Star:
I’m not sure about the specially blended for Toronto part, given that J. Lyons & Co. were tea manufacturers based in England.
Lyons became a corporate empire, eventually expanding to manufacturing food, running tea shops and restaurants, and even manufacturing their own computers. Former British prime minister Margaret Thatcher worked there as a chemist at one time. The company fell on hard times starting in the 1960s and was eventually broken up and sold to various firms.
But I wonder: what would tea specially blended for Toronto water taste like?