In July of 1926, Canada reduced its domestic postal rate from 3c to 2c per ounce or fraction thereof, and the rate on letters to the United Kingdom and the British Empire from 4¢ to 3¢. At this time, the post office had in stock almost 130 million of the 3¢ Carmine Admiral stamps- enough to last for 25 years. A decision was made to surcharge the 3¢ Carmine by adding the overprint "2 cents" and to use the surcharged stamps to help meet the expected demand for 2c stamps. Two types of surcharged stamps were issued: single- and double-line (Scott #139 and 140), of which 50,000 and 103,500 were issued, respectively. Scott '10 values #139 at $ 60.00 for unused ($100.- for NH) and #140 at $ 30.- ($50.- for NH).
Those readers who are on Facebook, LinkedIn, and Ebay are welcome to join the newly created "StampSelectors" groups, which will focus on philatelic investment and the stamp market. To get to them, simply search "Groups" under "StampSelectors."