In 1906, Hugo Gerard Ströhl, a famous Austrian heraldist, publishes Japanisches Wappenbuch, probably the first foreign book entirely devoted to Japanese heraldry. This 253-page publication proposes a bibliography that lists up both Japanese and foreign texts, including Georges Appert’s Ancien Japon. Follow a rather extensive historical study and a long list of daimyo (warlords) and their respective kamon. Ströhl finishes with a short chapter on flags and banners. Ströhl’s work is still to this day one of the most researched foreign publication on Japanese heraldry.
(STRÖHL Hugo Gerard, Japanisches Wappenbuch, Wien, Aaton Schroll & Со., 1906)
In 1909, Gordon Ambrose Lee publishes “Some Notes on Japanese Heraldry” in the Transactions and Proceedings of the Japan Society. As the title suggests, the author does not dig much deeper than his predecessors on the subject, but the article features a couple illustrations and interesting anecdotes.
(LEE Gordon Ambrose, “Some notes on Japanese Heraldry”, in Transactions and Proceedings of the Japan Society, VIII-2, 1909, p. 270-292)
Two years later, A. J. Koop publishes in the same journal “The Construction and Blazonry of Mon“. This is the first article that does not focus on history only, but rather studies the blazon (how to read a mon) in Japanese heraldry. It also discusses several aspects of kamon design and sets about correcting mistakes found in older publications. Most of the mon vocabulary found in Koop’s text is style in use nowadays.
(KOOP A. J., “The Construction and Blazonry of Mon”, in Transactions and Proceedings of the Japan Society, IX-2, 1911, p. 280-312)