: It lists known markings by country, providing reference numbers for each and describing the "jusqu'à" cancels used worldwide.
These items are the perfect intersection of aerophilately and maritime philately. Key Geographical Focus Areas in McQueen’s Study Jusqu-a Airmail Markings- A Study Ian McQueen
The true legacy of McQueen’s study is its impact on the valuation of postal history covers. A seemingly ordinary envelope from the 1930s with a sloppy, purple ink stamp saying "Jusqu'à Casablanca" might look like a flawed item to an untrained eye. Thanks to McQueen, collectors and auction houses recognize it as a scarce, highly desirable artifact of aviation and postal bureaucracy. It documents a precise moment when global logistics pushed up against the boundaries of technological capability. : It lists known markings by country, providing
When a letter reached the end of the paid air sector, it had to be transferred to a surface route (rail, ship, or road) for the remainder of its transit. To prevent the letter from mistakenly being placed on a subsequent flight for which no fee had been paid, postal clerks applied a "Jusqu'à" marking. The Core Function A seemingly ordinary envelope from the 1930s with
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