Here is an airline issue label from Canada from Yukon Airways & Exploration Co.
The Yukon Airways & Exploration Co. Ltd. was formed to operate in the Yukon territory. The company's main office was in White Horse and there were branches in Dawson and Mayo Landing. (source)
Year: 1927, Gummed. Günter Mair's catalogue no: - CAN-B-1, imperforated, size: 245x11.5mm,