Canada 1916 WWI Field Post Office CDS to St. Jean Camp Grenadier Guards Quebec

Soldier's cover franked with 2c Admiral War Tax, postmarked with Field Post Office 3X c.d.s. and tied by Montreal machine cancel (APR 25), to a soldier at ST JEAN CAMP, Quebec, with split-ring ST JEAN backstamp, and rare Canadian Grenadier Guards battalion handstamp on front, a scarce incoming cover to St. Jean Camp.