Canada #CP19i 85c Permanent Kiosk Stamp With Emily Carr's Painting and 14-Digit Code, Used on Commercial July 2018 Cover

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An attractive 2018 commercial cover, sent to me from a dealer in Vancouver on July 21, 2018. The postage has been paid using a single of CP19, which is the 14-digit Kiosk stamp featuring Emily Carr's painting. 

Unitrade only lists singles on piece, or mint, stamps, but does not list these on commercial cover. A used single lists for $4, so an intact cover like this should be worth $10.