I have gone through about 50% of my Scott 96 and 2 of them so far have this interesting anomaly..Before I send it off to Ralph, want your opinion. (top stamp has the anomaly)
This looks like an unerased guideline to me. Very similar to those found on the 5c value of this series. In addition to the well-known hairlines and re-entries on the Tercentanry issue, there are also a large number of retouches and other marks that are not well-documented.
An August 1973 article in Maple Leaves provides some plating information for this stamp which mentions a dotted guideline that appear among the top horizontal lines of this value in many positions from the top row. I think that is what you have here.
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