This cut gold coin is multi color pinks to orange to gold. Could not find a match on the Portuguese coin data bases so here it is.
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Based on your circle, what should be the diameter Zac?
That is what I was wondering.
If the member wrote the longest length maybe it could be worked out.
The letter after REG looks to be U but normally is I or E but not sure.
It should be these ones, denomination just depends on the size.
https://en.numista.com/catalogue/pieces25671.html
And if not, I think you will find some other similar ones here, on the 2-3 page of the search.
Are these pictures severely desaturated? Because it doesn't look the slightest like 90+% gold especially the pink that indicates a large amount of copper would be concerning.

Measurement and better pics coming 6/24/2022. The pictures are a bad reference for color. Thank you for the references, very close.
The member found it like that, cut.
I used one image and flipped it to the other side as well - showing it as it may look >
which shows the scrolling around the crown and shield.
Great job figuring its diameter. Looks like the portrait is possibly sporting a helm. Is it Portuguese?
aokart
Great job figuring its diameter. Looks like the portrait is possibly sporting a helm. Is it Portuguese?
Don't know but building on what ZacUK did, the letter after REG does seem to a an E. And with a diameter of 33 +/- 2, iiruig's second link looks good. Could also be this one from Brazil; N#35585 or something else entirely.
May be Brazil.
Even though it has POR lettering it may not be Portugal.
It may also be for Maria I with the REG lettering.
For the obverse lettering - but not for the reverse design:
The reverse has no lettering but a large crown above a large shield with scrollwork in between.
This reverse is similar but still different:
Thank you Zac. Found the same when trying to compare. Brazil seems to be the closest because of the lettering but a match its not. The reverse is more elaborate and distinct. Figured it would be an easy one to identify. Maybe counterfeit. Thanks again for your time. Art
I updated (lettering and rotation) my earlier picture …
… D G PORT ET ALG REG …
There can now also be seen a faint right-facing portrait.
· On here the countries with that lettering are >
Portugal
Brazil
Azores
· also
Curaçao [countermarked on Portugal]
Martinique [countermarked on Brazil]
Saint Vincent and the Grenadines [countermarked on Brazil]
That crown is not one continuous row of beads across the top -
it is in four parts; two on the left and two on the right. Like on this …
Still a different coin, but has a lot of scrollwork, like the coin in question.
ZacUK
I updated (lettering and rotation) my earlier picture …
… D G PORT ET ALG REG …
There can now also be seen a faint right-facing portrait.
· Looking to see what could be the lettering on the missing left section.
Only for coins that have 1 or 2 portraits on obverse and crowned shield on reverse.
· Some coins have that existing lettering split - such as D G PORT on the left,
then a portrait in the middle, and ET ALG REG on the right.
· Of those that have that all on the right-hand side, there are these -
either separately on the left, or continuous including across the top >
MARIA I ET PETRUS III D G PORT ET ALG REGES [continuous]
· Ah, that is it - just going by existing pages on here. May be others of course. Was thinking that there
would be several variations of lettering, but no. Only 1 coin from Brazil and 4 from Portugal -
all with two right-facing portraits. None of which have the same reverse as the member's coin.
· I did think anyway there were two portraits side-by-side, as that shown above does seem to be towards
the right-hand side of the obverse, as if to show there was another to the left of it on the missing section.
· Still not sure if it is even a gold coin - too much discolouration (in those pictures) in my opinion.
The obverse would have looked something like this >
with the green line roughly where it was cut. Such as >
Still looks like a U letter after REG maybe.
Is this very intresting coin-fragment gold indeed?
I suggest, have it XRF-tested, to be sure about the material,
if it is not gold, but maybe silver, than it gives more chances to find the real coin.
Metals who were in the soil, will get a big variety of colours/shades.
Thank you again for the hard work Zac. Digging many materials over the years only one comes out of the ground looking the same as it went in, gold. There is a rose hue to some of the coin. This would be considered a cut coin. Cut coins were like making change today for a purchase or payment. The site were it was found is in New Jersey, USA. The site has produced artifacts from the mid to late 17th century on into the mid 19th century. Hundreds of coins came from this site, a major place of business. Over a thousand buttons from this site lends credence to its extensive trade. Art
Zac the portrait has something a little different right over the portrait face. Damage, I dont know, but it is also a distinct feature.
Based on the pictures provided, I am not convinced it is gold.
Can you measure the fragment - does it agree with this previous reply >
[28.5mm across, making the original coin around 33mm]
The gold coins around that size are either 6400 Reis or a Peça denomination.
yvon
Based on the pictures provided, I am not convinced it is gold.
For once, I agree with you!
The coin clocked in at 18k or better.
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