The postcards of W.G. MacFarlane are extensively catalogued in the second edition of “The W.G. MacFarlane Picture Postcard Handbook, 1910-1910” by Michael J. Smith, a book that is essential for the collector of this prolific Canadian postcard publisher. The series numbers shown relate to Mike Smith’s book.
Series 20 shows the City of Hamilton crest. The earliest recorded postmark is noted as July 24, 1904. Mike Smith has recorded 6 cards in this series.
Cards from this series come with a W.G. MacFarlane publisher’s attribution. Note they found with either blue or green in the crest.