CANADIAN STAMPS
1946

SG OS17
Official
Special Delivery Stamp

Issued 16th Sep to 5th Dec 1946. Printed perf 12. For these official stamps the 'O.H.M.S' is type O2, punctured with 4 lines of dots to make up the letters. Don't confuse these with stamps that have the 'O.H.M.S' printed on them, this overprint was not used until 1949