Forgeries of Jusqu’à markings exist. Unscrupulous sellers have added fake handstamps to common surface mail to inflate value. McQueen’s study includes detailed diagrams of genuine lettering, spacing, and ink colors. For example, he noted that genuine “Jusqu’à Casablanca” handstamps from 1929 have a distinctive broken ‘A’ in Casablanca —a die flaw that forgers miss.

This comprehensive study by Ian McQueen delves into the fascinating world of airmail markings, specifically focusing on the "Jusqu'a" markings used on postal items. The book is a meticulous and detailed exploration of these markings, making it an essential resource for philatelists, postal history enthusiasts, and researchers.

: It provides a comprehensive, illustrated listing of different Jusqu'à handstamps and related air-cancel marks from around the world. The Supplement

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