Grading Thoughts About A 1789 Colonial Coin

That color/tone there shows a bit in the photos, but not too strongly. Perhaps just an area with a bit more copper present?

Looks like a nice piece - just a touch of wear on the high spots.

Nothing too blatant, but since there is just a SLIGHT curve in visible along the rim - is there any sign of mounting at 12 o'clock?

You do ALWAYS have to look on these Brazilian pieces, it seems... really on ALL older gold, as jewelry use was popular, it should be automatically checked.

That said, it's not a STRONG suspicion... I don't see any extra metal/discoloration there, just that SLIGHT alteration of a round perimeter - right at the magic 12:00 o'clock mark. Maybe that could be acceptable for the series? I don't know the Brazilian well enough to know off-hand (planchet style, edging technique, etc.)

AT MOST, there was a small neat loop there that was extremely neatly removed... or it may actually be perfectly untouched. I can't be certain.

As you said, always hard to tell from pics... but the surfaces don't look bad at all in terms of potential/cleaning, "sweating", or similar.

It will not be of use to the creator of the thread. But for whomever reads it now. These peças and dobras were struck on disks punched out of gold sheers that had been made by pressing gold bars between rollers.

The surface of the discs could be uneven. The punched discs might not be perfectly round. Then the discs had the edge engraved by sliding them between two moving bars with the tulip pattern. Finally they were struck. In all this they could be further deformed.

In the end many came out of the mint not perfectly circular. Diameter could vary by one or two millimeters. it was the weight that was controlled and that depended also on the thickness of the gold sheet used.

Good warning about the unevenness at 12 hours. Only by inspecting the edge could one be sure. But I thing it was just a normal irregularity of the disk.

Nice AU-55.