cdnum, the horizontal shading lines in the area are complete and well defined. It is my opinion that this is a relief break of the outer triangle frameline. A relief break is where a portion of the relief on the transfer roll breaks off, therefore not entering the groove for inking on the plate position. The line is clearly absent between 3 horizontal shading lines. Small relief breaks are not rare in some early stamps. I have not seen this variety before, very nice and interesting find. Scott does not list most small relief breaks.
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