Although the pictures are not as conclusive as the blown up pictures of your own........
CGS have a variety described as ........1851-03 second R in brittaniar over thinner higher R.
I would assume that it must be the same variety.
Well spotted and a good find ,both the N just appear recut,although i dont look at half pennies and may be wrong
Again it must be worth comparing / overlaying with a different R.