From Canadian government archives

This photograph came from the Canadian government archives, from an internet link that no longer seems to work. When it was published elsewhere, we tried to fix a date for it. The Finished Mystery was published on July 17, 1917, and then banned in Canada on February 12, 1918. However, this photograph appears to date from after the ban was lifted, and there was no stopping the IBSA in its endeavors to circulate the book.  At the bottom of the display the address for the IBSA was (?)0 Dundas Street, W Toronto, Ontario. According to the 1978 Yearbook history of Canada, the Bible Students’ headquarters in Canada moved to 270 Dundas Street in 1920. That would tally with the ban on the IBSA (and The Finished Mystery) being lifted on January 1, 1920.

So the photograph will date from 1920 or shortly thereafter.