Henry Gates, in his work "Canada: Patriotics, The Wilson Series" refers to a single variation of this postcard, in the series he designated as ”Soldiers of the Queen—Type I”. He denoted this card as P-1. A second very rare variation has been added, which includes patriotic Song Back 13, “Soldiers of the Queen”, on the reverse.
Above, the full card back, below, the detail of the song, "The Soldiers of the Queen", known to Gates as No. 13. The text at the bottom of the song notes "[By Pe]rmission of The Anglo-Canadian Music Publisher Assoc'n Limited, Toronto". Unfortunately, the left margin of the song has been trimmed in what appears to be an effort to fit the card into a photo album.
The bottom image shows the front of the card.