There appear to be 3 different variations of this stamp, while my book only supplies the necessary spaces for two variations of the series. Two of them are quite similar (The backwards looking "R" has a line at the top and bottom on one, while only the bottom for the other). The extra variation that my book doesn't recognize at all has a line going through the top of the inscription.
Here are the pics:
Two lines(R)

One Line(R)

Line across the whole inscription

P.S. The inscription is in the top right hand corner.