I received today this wonderful cover from a friend in Bangladesh. You can´t see on it any marking because this picture was made before she sent it :)
To mark the 150th Birth Anniversary of Tagore India, Srilanka and Bangladesh issued commemorative postage stamps on 7 May 2011. On this blog you can see more about Rabindranath Tagore stamps.
The 3 roses were issued on 11th february 2010 and are part of a set of 13 stamps. See them all here:
http://newissue.allaboutstamp.com/images/asia/1/128s.jpg
The other 2 stamps illustrate Coins of Independent Sultans of Bengal (1st series) issued on 21 July 2011.
Not too much info on the Internet about these items :(
