In the specialized field of , few researchers have contributed as much to the understanding of directional postal markings as Ian McQueen . His seminal work, Jusqu-à Airmail Markings: A Study , remains the "gold standard" for collectors and postal historians seeking to decode the often-mysterious handstamps found on early 20th-century airmail. What are "Jusqu-à" Markings?
For collectors, McQueen’s work transformed "Jusqu’à" marks from mere auxiliary strikes into a complex field of study. Their presence provides a "map" of a letter's transit, revealing: Postal Rates: Evidence of how much the sender was willing to pay. Transport History: Jusqu-a Airmail Markings- A Study Ian McQueen
Ian McQueen (1919-1999) was not a mere collector; he was a meticulous postal historian. A Fellow of the Royal Philatelic Society London, McQueen specialized in the complex routes of the French Aéropostale and the early Pan American Airways. His approach was forensic: he did not simply list markings; he reconstructed the flight schedules, surcharge tables, and postal treaties that gave rise to them. In the specialized field of , few researchers