Dudley, it looks like my copy is a very early printing. The details are extremely sharp. It was an interesting comparison that I did with your stamp. I marked up some closeups with arrows, red for Neinken's plating marks, and violet for "other" marks not shown on the plating drawings and seem to be early only printing marks that wore away. There was no other plate 1 late stamp with similar marks in the upper left area.
This first image compares the top left scratch marks. Neinken shows 2 scratches. On the worn copy, these lines are barely visible. On my copy, I can count 5 scratches longer than Neinken showed.

This second image shows the upper right marks. The dots are clearer but the dash is not present on my copy.

The third image here shows the "consistent" dot on your copy but not on mine. The sharpness of my image is really noticeable here.

The fourth and last image markup shows the dot in "O" as shown on Neinken drawings. My copy shows 3 dots in the "O".
EDIT: I changed this image. It appears that there are 3 scratch lines that go from the left edge through the "O" which may have made the marks in the "O". The lines are barely visible. One ends almost at the top of the "N". Maybe I am just seeing things.

My conclusion is that both stamps are 35L1L. My copy must be a very early printing and that "consistent" dot is not so consistent, only on later printings. I am sure that I can find other marks on my copy that will not be shown on later copies.
Is there any doubt that the stamp is 35L1L?