I suspect some deviation can be attributed to shadowing artifacts on the base images used for each individual coinage year rendering. Causing me to establish coordinates slightly out of place thus creating a small rendering error. But most of the differences you see is attributed to engraving performed on hubs and dies from one year to the next. All having a common two digit master in their lineage and 1910 to 1916 also having a common 3 digit master in their lineage. Now if you would like to contribute some of your multi-stacked images for each year to the study - I would not object.
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