It is a 57 L1L, thanks for your help. How rare is this stamp.
It is a Scott #9 (Type IV).
I believe it might be position 57 on the left pane of plate 1 (Late state).
Could also be position 67
Hope that clears that up.
How rare is it? Not very.
Yours is cut in at the top which would detract from the value.
Here is my copy of 57L1L for comparison.