Rs.10 - Mahatma Gandhi Series :
Rs.20 - Mahatma Gandhi Series :
For notes of 5, 10 & 20, the first 3 characters are the prefix and the next 6 are the serial numbers. The first 2 characters of the prefix are a numeral and the 3rd is the alphabet. The next six characters are the serial numbers which begin from '000001' to '1 million'. For example: 00A 000001 - 00A 1000000. The next series would be 01A 000001 - 01A 1000000, and so on..
For denominations of 50, 100, 500 & 1000, the first 3 characters are the prefix and the next 6 are the serial numbers. The first character is a numeral and the next 2 characters are alphabets followed by the 6 digit serial number which begins from 000001 - 100000.
For Ex.: 0(Zero)AA 000001 - 0AA 1000000; the next series 1AA 000001 - 1AA 1000000 and so on..
There have also been issues having inset A, B, C, E, F, G, L, M, N, P, Q, R, S, T. Not all denominations have all the insets. From 2005 onwards, the year of issue is also printed in the bottom centre on the reverse of the note. In the prefix, only twenty alphabets are used. No prefix with alphabet 'O', 'I' & 'J' are used as these are confused for numerals. Also alphabets X, Y & Z are not used to round the number of prefixes to twenty or multiple of ten for accounting purposes. The practice of year of printing of the year of issue on the reverse of the note began in 2005. The year of issue was necessitated since the volume of notes that were printed would one day exhaust the first 3 characters of the prefix. Therefore, from year 2006, the series commenced with 00A or 01A all over again.
Insets used by different printing press for ROI notes:
From the year 2006, the Reserve Bank of India issued notes with a * (Star) after the first 3 characters or prefix followed by the six digit serial number. These were used as replacement notes for errors in printing.These were issued initially in denominations of 10, 20, 50. From 2009 star or replacement notes were issued for Rs.100 also.