stamp has some perf and centering issues
but I thought would be good/easy stamp to plate with centerline present
I was wrong (at least for me)
please help me figure this out

My logic so far:
type? Geez I thought it was a V (Scott 24) when I first saw ornaments incomplete upper right
but then has complete lower line at bottom
must be a II. (Scott 20). could be a IIIa (Scott 22)?
has to be left pane position (10 ,20, 30, 40 , 50, etc), right?
Are those curls I see (see arrow above "N" at bottom left)???
Are there curls on plate 11 or 12? It must be these plates (secret mark, right?)
Help please. (txstamp, Dudley, Sinclair or any others?). didn't mean to leave anyone out.