1894-1938 four DLO wax seal covers incl. 1894 OHMS returned dead letter #10 cover (D.9.-1,000-25-4-'94 , registered with large wax seal on reverse "Dead Letter Branch Post Office Dept Canada (crown); 1913 DLO return envelope 5D.L.(a)-20,000-11-3-13. registered with wax seal "D.L.O. Canada Montreal Branch (crown)" on reverse; 1933 DLO postage due 3¢ return envelope form 12 1/2 D.L.(a) 80,000-9-2-32 with "D.L.O. Canada Montreal Branch (crown)" wax seal on reverse; 1938 Canada Post Office envelope with "Inspection Service Dead Letter Office Ottawa, Ont" handstamp, registered with 13¢ postage due with D.L.O. Canada Ottawa Branch (crown)" wax seal on reverse. (Image)