Canadian Contingent 1900 Envelope to Barrie Ontario

CANADIAN CONTINGENT: 1900 Envelope addressed to Mr H B Myers in Barrie, Ontario, Canada. The letter bears F-VF strike in red of the CANADIAN CONTINGENT APR 18 1900 oval, nicely placed to upper left. Franked OFS VRI 1d tied FPO cds AP 15. Backstamped on arrival MY 21. Scarce example of this sought-after contingent mail.