Terre-Neuve C3c

1921 Thirty-five cent Halifax Airmail, a nicely centered mint single of the INVERTED OVERPRINT ERROR, showing wide spacing (2¼mm) between "AIR" and "MAIL" and period after "1921", bright colour and large part original gum; pencil signed by airmail experts - Giulio Bolaffi and Alberto Diena, Very Fine (Unitrade C3c; catalogue value $10,000)

Expertization: 1963 Giulio Bolaffi certificate

Dalwick and Harmer reported four panes received the inverted overprint in error. The example offered here is allocated to the first pane; overprint impression is well centered vertically and horizontally.

A RARE AND DESIRABLE AIRMAIL STAMP - ONLY 28 EXAMPLES WERE PRINTED (FROM THE FOUR PANES). THIS STAMP ORIGINATES FROM THE BEST CENTERED PANE.