UK postcards of Canadian subjects

This card contains the strip of ~10 photos of "cowboys and Indians" shown separately. The strip is credited to the Valentine & Sons United Publishing Co. Ltd. of Montreal, Toronto, Winnipeg and Vancouver but the rest of the card appears to be from the U.K. Valentine's. It is described as a "Mailing Card" and was printed in Great Britain. It was mailed at Battleford, Sask. on December 9, 1924 (I believe) to Mmiss Margaret Moss, 43 Queens Rd., Northampton, England and a "From" line on the opposite half of the back is filled in with the name "E. B. Snedker". The card has an instruction I haven't seen before which is that the "letter" half of the back can only contain the name and address of the sender -- "If any other writing, Two Cent Stamp is required." Perhaps this was an English requirement in the 1920s. The verse on the front is the opening lines of the rarely-heard second verse of O Canada! (the national anthem). This version of the Saskatchewan card (i.e. with the cowboys and Indians strip) is not listed by Smith as part of Series 24 Valentine & Sons (see p. 246 of Vol. II of his patriotics book).

Miller & Lang, Art Publishers, Glasgow and London. Letter from Mrs. McCarthy to Mr. Shiers (?) that doesn't say very much except that they have both been unwell.