Please take a look behind lincolns head. There is a vertical raised line that matches the location of pillar 10 on the reverse. Close to that is another raised line that matches the pillar width, although the second vertical line does not show on the scan you can see it with an angled light.
On the reverse is an area in the middle of the memorial that looks like a square chunk of something...
Thanks for input in advance.
On the reverse is an area in the middle of the memorial that looks like a square chunk of something...
Thanks for input in advance.

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