This is a fun vintage nautilus shaped brooch. Signed MX221 on the back. This may be rhodium plated. The serial stamp looks the same or similar to other Boucher pieces we've seen, but we aren't able to confirm it was part of the Marcel Boucher Mexico line. Fantastic design & movement! It is in fair condition and priced accordingly--there is a more obvious spot on top with silver tone loss and then other areas around the brooch. There is a small dent in the silver area, and the pin is slightly bent. Great for any collector! Please see photos for more detail.