HYDERABAD
The banknotes of Hyderabad were issued from 1918 until 1953. The ruling Nizam of Hyderabad was Mir Osman Ali Khan. Notes issued as early as 1916 have been reported. Hyderabad was the only Indian Princely State that was permitted to continue issuing its own notes after being united into the Dominion of India in 1948 and the Republic of India in 1950. The Hyderabadi rupee was an independent currency separate from the Indian rupee.
The notes are dated in the Fasli Era, so adding 589 to the FE date will convert it to the AD date.
In 1932, a quantity of unissued, but water stained Hyderabadi notes in 5, 10, and 100 rupee denominations were recovered from the S.S. Egypt, which sank off the island of Ushant near Brest, northern France in 1922. Many of these were given a special stamping and sold as souvenirs. These notes were in the process of being shipped from England where they had been printed. These notes are of historic interest to notaphilists. Some of the notes are printed slightly later than the dates that they bear.
The double letter serial number prefix determines what series the note is located in. Some of the 1939-53 issues have a single serial number prefix series code letter.
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The notes are dated in the Fasli Era, so adding 589 to the FE date will convert it to the AD date.
In 1932, a quantity of unissued, but water stained Hyderabadi notes in 5, 10, and 100 rupee denominations were recovered from the S.S. Egypt, which sank off the island of Ushant near Brest, northern France in 1922. Many of these were given a special stamping and sold as souvenirs. These notes were in the process of being shipped from England where they had been printed. These notes are of historic interest to notaphilists. Some of the notes are printed slightly later than the dates that they bear.
The double letter serial number prefix determines what series the note is located in. Some of the 1939-53 issues have a single serial number prefix series code letter.
Please read the whole information at this link
Also read this link