A  cover showing slogan Coutts # H-605 "HELP TO WIN THE WAR BUY WAR SAVINGS CERTIFICATES "  Franked with Unitrade / Scott # MR4 stamp (2 cents + 1 cents brown - War Tax Issue) tied to CDS cancel (HAMILTON ONT. / MAR 6 / 7 PM / 1917) on a cover mailed to Ottawa, Ontario Canada