Imitation with interesting punch marks

I find myself getting more interested in the punch marks / test punches / counter marks seen on some RR specimens. And this is just a fascinating article by Gazdac and colleagues. Can’t wait to see the full details of the hoard when that comes out. I’m especially interested in learning more about the methods used for the Metallurgical testing, particularly the investigation of pre existing ‘minute cracks’ though non-destructive techniques to compare surface and interior readings.

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