I'm not an expert, so I'll paste the explanation I found through a search. Frame France This is a general term for vintage eyewear using French-made frames from the 1940s to 1950s, which are said to be the world's finest. The beautiful colors and luster are captivating, setting them apart from current products. They have an elegant roundness, with sharp angles where they should be, and the hand-cut lines, both straight and curved, are exquisitely finished. Please enjoy the profound world that is the foundation of modern frames. Please purchase only if you understand vintage items. If you need to confirm details such as minor scratches, please ask questions in the comments beforehand. If you have any concerns or questions, please feel free to ask in the comments section before purchasing. Thank you for your consideration. Vintage Glasses French Vintage Space Age Lesca 40s 50s Lesca Guepard Speakeasy GIGLAMPS AHLEM maxpittion CEBO