I recently purchased an old mid-to-late 1970s Butz Choquin Origine Unie. I know that they used to use albatross bone for the extension and have changed over to acrylic now. Does anyone know when the change occurred and/or how to test the material in a non-destructive manner?
http://i1309.photobucket.com/albums/s634/jgriffit40/T2eC16ZHJFoE9nh6pMoBRZ7zDsVg60_12_zps812e2974.jpg[/IMG]]
http://i1309.photobucket.com/albums/s634/jgriffit40/T2eC16ZHJFoE9nh6pMoBRZ7zDsVg60_12_zps812e2974.jpg[/IMG]]