Not sure I know exactly what you are asking. Yes, the doubling effect looks rather uniform in position, but not in height. This is a multi-hubbing era, so the doubling should be close to the same height for a similar class of doubling. This is of course the far extreme, but if your doubling on the date was due to a rotation of the die, the force of the hubbing would be similar, so the height is almost exactly the same, where they overlap, they blend together, but the surface appearance are similar If your coin was struck by a true doubled die, the flat area that is doubled would be close to the same height and have the same surface appearance rather than one that is normal and one flatter. What happened with yours is that a normal die struck the coin and due to a mechanical looseness someplace, as it rose away from the coin it shifted and moved most of the ~80 up. shearing away from the base a little ( upward in the photo) That is why the base part is flattened appearing ( shear is a better term I think, but flattened in appearance is more common). Now there are some DD that are hard to tell, as maybe the pressure wasn't exactly the same in the second hubbing. so you have to use other criteria and understand the different classes of Doubled dies to make determinations. Hope this can help and others can give more examples or info. Jim
