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The stamp looks similar to the Scott 180-U18 in chart
Uh, how did you come to this conclusion? All of the stamps look similar to each other, and all are relatively well centered (except for yours). If you are talking about the color shade, remember that all of these were scanned separately, and you cannot trust the color differences at all.
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Lioness, there is one way to settle this. Have your stamp certified. It's that simple!
100% agree. Post your results back here once you find out.
Note: No one ever posts their results once they find out ... sigh.