Canada #CL3 Twenty-five cent Laurentide Air Service pane of twenty July 24, 2020February 12, 2013 by Sparks Auctions Coming in Auction #12: Canada #CL3 1924 25c. Laurentide Air Service pane of twenty, a scarce, fresh and well centered pane with light hinge marks in the 4 corner selvages, else never hinged and all very fine. Unitrade CV$4050.