1948-49 Kishangarh 8a brown handstamped "RAJASTHAN" with error handstamp in blue instead of red. The blue handstamp, while recorded on other stamps,  has not been recorded on this stamp mamking this the discovery example and possibly unique.

1948-49  4a brown on thick soft unsurfaced wove paper with "RAJASTHAN" handstamp in violet instead of red. Note that the violet handstamp is recorded in other denominations but not for the 4 annas.