This variety comes in two distinct states - with (1R8.1)and without re-entering (1R8.1S2). As with most CPVs, the intensity of the variety diminishes with time.

There is a very similar variety on the Three Cent. (3F8.17)

There are also other similar varieties on the One Cent (2P1). These are not yet proven to be constant - and are currently not numbered.

An 1882 date was reported by Jim Beattie.