Authentic? 1625 Duchy Of Saxe-Altenburg Thaler

Also, if any of you have any great resources for learning about thalers from the 16th, 17th, and 18th century, I would greatly appreciate it! This is the first thaler I have ever purchased, and it was a bit of a spur of the moment purchase. Nonetheless, I find it very interesting and would love to go deep into learning how these things were made, how many are left, what the market for these are, etc. etc. Thank you!

Krause
World Crowns and Thalers (I have a copy)
indicates that there is a huge number of European silver coins of crown sized module.
Fakes of these are around.

A large catalog may warn of fakes, but that is about all.
Most of the older European sourced fakes are in good silver.

XRF may show up poor silver, but won't necessarily help to confirm as authentic, if the silver is good. It is possible that a good fake can have been made from recycled coin silver.

To confirm the pictured coin as authentic, expert opinion may well be required, but from my meagre expertise in this area,
it looks OK on screen.

Thank you for the comments so far :)

@tdziemia It is quite spectacular and much larger than I expected. It's unfortunate that so many scratches are on it though. I suspect that someone thought using some form of hard abrasive was a good way of cleaning off the patina and stopped half-way. Shameful to be honest. I'd love to know how many were minted and survived. NGC lists this piece at $50 in lower conditions, so I don't think it could be too rare compared to other thalers. Still, how does a coin like this survive for 400 years? Suggesting that less than 1,000 have survived might seem a little low to me, but perhaps there aren't many of these examples left in the world.

@new, I think that it is probably worth (non-destructively, e.g. XRF as mentioned by @sel) finding out the metal alloy on this one. The flaking black patina concerns me, but who knows what indignities a coin might undergo in nearly 400 years?

The coin was made by roller press and cut by big, weird scissors. The edge looks too smooth and there is an odd elongation. The legends are soft, though the apparent double dies are a good sign. The dentils or denticles are poor. Two thumbs down.

@Westwood The edge is roughly 2mm in thickness all around, with the thinnest segment of the edge being roughly 1mm. 2mm is not mentioned on the Numista page, but this width is mentioned for other Saxe-Altenburg thalers from that time period.

The edge is a bit smooth, but there are segments of the edge that do show signs of filing(?). Perhaps the images I've posted don't do it justice, but I can post some images later to show this section. I'd say the length of the diameter that indicates filing is roughly 40% of the coin's total edge. Also, there is a segment of the edge on this coin that is not completely vertical, but a little diagonal (or crooked). It's really hard to image this, but I can try.

Also, what do you mean by the double dies on the legend being a good thing? Do you mean some of the legend appearing to have been double-struck? Also, do you mean the denticles on the perimeter of the coin?

Doubled dies are harder to cast. For edges refer to "Small Study Of And Questions About Early Talers" posted here in April.

@Westwood Just out of curiosity, how did a double die come about if these coins were made via the roller press? Was the equipment the minters used back in those days just poorer in quality?

Also, when observing the side/width of the coin, there are two noticeable sections where the width of this coin is not the same. I'd say it's very roughly 60/40, which 60% of the width being around 2mm in length, and the remaining 40% of the width being slightly shorter, around 1mm in length. I don't know if these characteristics means anything in terms of its authenticity, but maybe this points to this coin having been roller-pressed rather than stamped? Also, this particular thaler is a little larger on the diameter side, with a numista listed diameter at 43mm. My coin is also about 43mm in diameter. The reason I mention this is because the width on this thaler is a little smaller than other thalers with diameters between 40-42mm, although how much of an impact diameter would have on width length I'm not sure. Other people have mentioned the thinness of this coin as being a reason for why this piece might be a counterfeit.

@Spence thank you for posting your coin! Fantastic piece!