8 Reales Carolus IIIi 1808 PTS Pj, Questionable Autenticity

Jbuck, thank you for the welcoming message!

I have discussed what the coin could possibly be with some friends of mine (none of them a coin expert, so just our logical considerations).

Based on the measurements and tests listed in the top post, the coin seems to have a correct weight, overall dimensions and chemical composition, but the quality of at least the blank seems poor. So the possible choices we could come up with are:

1. An original. Is it possible, that Bolivian mint at the time cared about the weight and composition, but otherwise allowed the quality of the blanks to vary?

2. A circulating counterfeit. Unlikely, little sense to make it of a correct alloy with a correct weight.

3. A relatively old counterfeit produced by a foreign entity out of convenience for use in the international trade. Is any country or private company known to have imitated Bolivian 8R pieces like US did to their Mexican analogs?

4. A relatively modern numismatic fake. Not sure why to undertake the effort to imitate the alloy and weight correctly, but miss the quality issues which affect the looks of a product and will be the first thing to alert a potential buyer?

Will greatly appreciate if any of the forum's subject matter experts reviews my findings and considerations and shares their own educated opinion.
I'll not bump this topic anymore, not to bother the readers with it if it happens to be of a little interest for them :)

P.S. After extensively reading this forum and other materials, I'm inclined to conclude that mine is an original piece. No one seems to have cared to counterfeit Potosi in silver with the correct weight and composition in the old times, and probably no one will bother to fake it in good silver now. So high chances it is an original made on a worn screw press with somewhat tilted dies of a blank of a mediocre quality, not much against Potosi traditions. Washing the coin in acetone to remove the green PVC stain and putting it to the album with an easy heart.

Jgenn, a good point!

These are the irregularities I found on the edge.

The first (a duplicate circle) is diametrically opposite to the second (looks like overlapping rectangles).

But there is a third one which has no counterpart across the coin - a severely broken something instead of a circle and a part of a rectangle.

Please take a look at the images. Provided there is a third irregularity (if that doesn't look for you like something created in the coin's circulation time), there's a big chance the incorrect edging process was used and a coin is some sort of a fake?

That spot is a depression that arouse my initial suspicions about the authenticity of the coin, altogether with the cracks in the obverse, because it looked like something that could be a blister in a cast metal. These defects are mentioned in the initial post and are visible on the first photo. But it could be as well a trace from a piece of external material (sand, dirt etc) that got between the surface of the planchet and the die during the striking process (I have seen the likes on the rolled steel stripes). There is a similar but smaller and less visible defect at the very bottom of the bust right in the middle between 18 and 08.
These defects should have appeared at some point in the coin manufacturing process, as they don't show up in any way on the matching spots on the reverse side, thus are unlikely to have been created during the circulation/storage.

P.S. As for the cracks, they could have appeared as a result of the metal impurity on one side of the ingot during rolling into a stripe or minting and/or as a result of some technological violation (did the stripes or blanks have to be annealed before further processing?)

jgenn, thank you very much for sharing your knowledge!
As the most prominent of the cracks are parallel to each other, they indeed could have formed because of a non-relaxed stress perpendicularly to the stripe rolling direction if annealing after some of the metal-forming steps wasn't done properly, not because of some metal impurity like I guessed before.
I'm very glad that I found this forum, had a lot of good reading during recent days. The level of expertise of the forum members in the topics like Hispanic-American coinage is more than impressive, it's fantastic!

threefifty, thank you for the information! Indeed, swamperbob wrote about it in some earlier threads.
This coin already brought me enough pleasure studying it with the help of the forum to justify having acquired it :)