100 Rupees No Date

Pick 91 spans three RBI governors — Rangarajan, Jalan, and Y.V. Reddy — across nearly a decade of issue, making it one of the more administratively complex entries in the modern Indian series. The plate letter system used here is a simple prefix tool for tracking printing batches, though the sheer number of signature and plate letter combinations documented for this single type reflects the scale of India's currency production demands during this period.

Rangarajan's tenure ended in 1997, Jalan's in 2003. Any note signed by Reddy therefore dates from the final years of the series before the ₹100 design was updated.