India 20-rupee note without inset letter reported

The Reserve Bank of India (RBI) will soon introduce a 20-rupee (US$0.40) banknote without inset letter bearing the signature of Dr D Subbarao, Governor. Except for the change in the inset letter, the design of these notes to be issued now is similar in all respects to the banknotes in Mahatma Gandhi Series - 2005, with additional/new security features issued on 16 August 2006. All 20-rupee notes issued by the RBI in the past will continue to be legal tender.
Additional information and images are requested.