Great reproductions of large third Reich post stamps to celebrate birthday of the Führer. This one were issued for Germany in:
1940 (51st birthday)
1941
1942
1943  
and the last one in 1944 (55th birthday)
The stamps have no gum on the reverse. Sold in strips of 5.
 
What about the other birthdays?
 
It's only 6 years after becoming the ruler of Germany, on his 50th birthday in 1939, the day of April 20th became a national holiday. There was no dedicated stamp issued by German Post that year, but they issued
a collectors card (see here) and
a postcard (see here) 
both commemorating his spectacular accomplishmentstill date. 
 
As for the last birthday, in 1945, the situation was too grim for anyone to design and manufacture a birthday stamp. Thus 1944 was the last one.