This a Dino 246/206 Rear Glass (reproduction)
Owner states this is from the Brandoli located in Modena, Italy.
They are known for having many hard to find parts for Dinos. I have used Brandoli for other items and have been satisfied with the quality. I have purchased headlight covers for the Dino that has the correct curve, unlike so many other vendors. This is not an OEM product but it is being offered by the seller for $2,900. I dont know if this is a good deal but finding an OEM window is getting scarce. If you are in need of a rear window, I would suggest calling every vendor first to see if anyone has one stashed away. Only then would I contact vendors in Europe like Brandoli, in Italy.