W.G. MacFarlane’s Series 72 postcards (as catalogued in the second edition of “The W.G. MacFarlane Picture Postcard Handbook, 1910-1910” by Michael J. Smith, which illustrates 4 of the designs of this series) were a special pull-out series with multiple views accessed by pulling out the tab at the bottom of the card. Being a heavier card, they required a 2¢ stamp for postage, which may have restricted their popularity. They also appear to have been a premium card, likely selling for more than standard cards.
The cards were based on a design which noted “WHITE”S PATENT. Registered and Patented at Home and Abroad.” The cards are by the Photochrom Co. Ltd., London. Some cards carried the text “Published by W.G. MacFarlane, Toronto”, while others had the text “Agent for Canada: W.G. MacFarlane, Toronto”. Cards with no MacFarlane attribution also exist. The cards came with two varieties of ornamental design on the front, and two colours of the card, a light green, or a tawny colour. It seems both colours can have both ornamental designs, and the same towns may have cards of each type.
The cards have cities as subjects, and also have non-city subjects including Ranching & Harvesting, and the Indians Series.