Quote:
Originally Posted by Johnny630
New technology will hopefully be able to figure it out by being able to determine the thickness of the card throughout as consistent to said manufacture and year.. As you say a “pressed corner”usually results in thinning of the paper stock towards the corner to me that is alteration.
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A lot of corners that have been pressed out, on vintage anyhow, are pretty obvious if you look at the edges, for exactly the reason you described, the thickness just disappears. I remember returning a PSA 8 US Caramel Ruth back in the day that had just this appearance. The seller (who turned out to be a major doctor) told me it was from being stored in a screwdown. It's not always easy to get a good look at edges, of course, in a holder.