1799 R6+ Gold Eagle On Stack's

So the rectangular marks on the Heritage coin mean nothing.
Thanks for explaining them.

I think people have overracted massively to the brutal description of this coin as 'plugged', a description normally used to describe a crude and obvious attempt to fill a hole.
By contrast, the expert seems to have made it almost imperceptable, so that only the slightest disturbance to the area where there was a hole is all that can be seen.
'Skilfully repaired' and 'barely perceptable', it does not detract from the coin's appearance in any way.
By the way, I contacted Stack's about the letter 'U' on the reverse. It is exactly as all the other letters - I was told the light reflection shone on the capsule and reflected back.