Same as Type 6.6.3 except a visible security line overprinted in silver, aligned with the security thread now on right half of the note. 50 added to left of Mahatma Gandhi and five horizontal bands in the centre in watermark. Front to back see through register above Ashoka Pillar reads 50 when viewed against light. Overall pink colour of the note made lighter. Additional circular floral prints added on either side of Reserve Bank of India on obverse and in right margin on reverse. Year of issue added on reverse.
Note
See through register
Reverse
Obverse 
When viewed against light
ReverseObverse When viewed against lightTable
| Type No. | Signature | Inset | Prefix | Year |
|---|---|---|---|---|
| 6.6.4.1 A | Y. V. Reddy | AA - AS... | 2005 | |
| 6.6.4.1 B | Y. V. Reddy | E | AA - AV | 2005 |
| 6.6.4.1 C | Y. V. Reddy | L | AA - AV... | 2005 |
| 6.6.4.1 D | Y. V. Reddy | R | AA - AS... | 2005 |
| 6.6.4.1 E | Y. V. Reddy | ...AW - BR... | 2006 | |
| 6.6.4.1 F | Y. V. Reddy | E | AT - FE... | 2006 |
| 6.6.4.1 G | Y. V. Reddy | L | ...BA - DA... | 2006 |
| 6.6.4.1 H | Y. V. Reddy | ...BS - CM... | 2007 | |
| 6.6.4.1 I | Y. V. Reddy | E | ...FG - KP... | 2007 |
| 6.6.4.1 J | Y. V. Reddy | L | ...DB - EF... | 2007 |
| 6.6.4.1 K | Y. V. Reddy | R | ...AV - BQ... | 2007 |
| 6.6.4.1 L | Y. V. Reddy | ...CN - DL... | 2008 | |
| 6.6.4.1 M | Y. V. Reddy | E | ...KR - NP | 2008 |
| 6.6.4.1 N | Y. V. Reddy | R | BR - CP | 2008 |
| 6.6.4.2 A | D. Subbarao | AA - AP | 2009 | |
| 6.6.4.2 B | D. Subbarao | E | NQ - NU | 2009 |
| 6.6.4.2 C | D. Subbarao | L | AA - BL | 2009 |
| 6.6.4.2 D | D. Subbarao | R | AA - BM | 2009 |
| 6.6.4.2 E | D. Subbarao | ...AP - CQ... | 2010 | |
| 6.6.4.2 F | D. Subbarao | E | ...NU - ... | 2010 |
| 6.6.4.2 G | D. Subbarao | L | BL - ... | 2010 |
| 6.6.4.2 H | D. Subbarao | R | ...BM - ... | 2010 |
| 6.6.4.2 I | D. Subbarao | ...CL - ... | 2011 | |
| 6.6.4.2 J | D. Subbarao | L | ... - ... | 2011 |
| 6.6.4.2 K | D. Subbarao | R | ... - ... | 2011 |
