Scott No. 24 - Plate It

Anyone care to plate this on-cover stamp? Dave

Magnificent
Not enough knowledge, but here you have some fellows with tons of knowledge.

A difficult one to plate. Source photos for comparison are few and far between. As a result I have only been able to narrow the field to the (4) best candidates (guesses) which I rank below on probability of a match. I know that's not what you wanted to hear but I'm not the guru here. Maybe another Forum member will have one or more of these positions and can chime in with a better scan or other ideas.

95% - 73L8
80% - 80L8
78% - 33L5
75% - 78L10

I think 73L8 is correct. Here is an example cropped from a cover front. Compare the scratches running NE-SW under ON of ONE and the dot under the left leg of the N of ONE. My copies of 33L5 and 80L8 do not show these features. I do not have 78L10 but the Doporto image does not show it either.

I saw the faint scratches on the ops stamp and very faint ones on the Franklin plating site, which led to choosing it as the prime candidate. Good job Dudley.