First Day Covers under Edward VII
The relatively short reign of Edward VII (10 years) gave existence to only two series of stamps: A set of definitives (date of issue: 07/01/1903 for 1,2,5,7,10c values, 9/27/04 for 20c and 11/19/1908 for 50c) and the 1908 Quebec tercentenary set (date of issue July 16 1908).
No First day cachet is known for the definitives. A few postcards are
known for the Quebec Issue.