Morning all, am in the process of buying a couple of 2 rupee notes and it seems, based on serial numbers of each note, that each belong to different issues (according to the seller). For example, the note below, is apparently the second issue of this type.

While this note, is the first issue.

There must be some reference that tells you how to decipher these serial numbers into years of printing and offcourse the issue number.
Is anyone aware of such reference material?


