Jusqu-a Airmail Markings- A Study Ian Mcqueen -

Title: Navigating the Skies: An Overview of "Jusqu'à Airmail Markings - A Study" by Ian McQueen

2. Physical Typology (The “Mark”)

Visuals

: Common marks include purple parallel bars (mute bars) used to strike through airmail instructions.

Why McQueen’s Study is a Collector’s Bible

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