While this large stock pot isn’t from the vintage era, in my opinion the thicker copper bottom isn’t quite as critical in the stock pots as they are more than likely to be used for liquid items where “spreading the heat” isn’t quite as important. While there are fair number of stock pots larger than 8 quarts on eBay, the vast majority of them are 8 quarts or less. And to find a brand new one in the 12 quart size .. I’m not sure I’ve seen one in this size and this condition before.
So if you want to add a nice shiny trophy pieced to your collection, this might be the one for you. The price is not unreasonable for what it is.