Wm. Tyrrell & Co.
Wm. Tyrrell & Co., Booksellers, Society Stationers and Engravers was located at 8 King Street West in Toronto, as of June 1900, according to their postal stationery card used for business transactions of that date.
The company produced a series of undivided back patriotic postcards featuring scenes of Toronto, of which I have encountered them postally used from 1904 until 1907. The cards are sequentially numbered on the front.
Below, an example of postcard back from this publisher.
