8 Reales 1839 Mexico - Inverted "D" In "10-D" ?

Hi, I think it is 100% authentic 19th century coin, it has secure edge and weighs 25.5 grams (quite worn), 38.5 mm diameter. But this is my first coin of this type.
Looks uncleaned and authentic silver coin.

Well, that looks like a drill hole on the obverse. That might've been done to see if the metal composition was uniform because it was suspected the piece wasn't genuine. Also, sometimes a hole was drilled to "cancel" a coin, that is, to mark it as a counterfeit, but in that case the coin was usually drilled all the way through. The weight's a bit light, but as you say, there's wear to consider. I'm not crazy about the appearance of the edge. But I'm not trying to run it down - whether it's authentic or not, it's still highly intriguing.

Hi everyone!

I´m just a little nervous because is my first post in this forum but I will try to do my best.
I´m not an expert but my opinnion is that this coin is a forgery, the weight is very low and the caracters are different to the original coins in Durango die style 1832 - 1842. Certainly there are people really expert in this group and I will be very interested in their review.
I don´t have any in this date but compare this from 1833. Regards.

Considering the engraving error, the suggestive patina or skin, and the low weight (though not shockingly low - there was some variation even with genuine Cap & Rays of most mints, especially early on), almost certainly a contemporary counterfeit... For those who aren't familiar with them, this is a rather frequent phenomenon in this series (Cap & Ray 8R). As mentioned, SwamperBob, who has to be THE most dedicated accumulator of these, will surely comment when he gets a chance.

EDIT - Decided to not be TOO lazy... it's Riddell 376.

Oh, I forgot to add - one reason I wsn't too workred up over the coin's weight was that I know I read somewhere that up into at least the 1840's, the Durango mint was notorious for inaccurate assays. So 25.5 grams, while off, wasn't enough off to be a reliable diagnostic in this case.

Thanks realeswatcher!
I have been lookin' at Ridell's and you're correct. Same inverted D, same die style. But the weight is still to low, in Ridell's book the weight of contemporary counterfeit was very nearly 416 grains, 27 grams actually.
The fineness must be 450 so, let's melt it!!
Just kidding!

Someone just called my attention to this thread.

The coin is one of the myriad of contemporary counterfeits of the French die style that flooded the US about the time Riddell wrote his book. There are reversed D types like this and a badly tilted D. These forgeries were European in origin (or at least the dies were) and they were made from at least two master hub sets.

This particular counterfeit the 1839 with the reversed D is NOT as common as it's cousins and I would definitely buy it.