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http://theshiveringbeggar.com/wp-content/uploads/2013/01/IMG_8162.jpg

These are pressed horn, from around the same time. While this set is black, you can see that they're also very thin. About the...

They're either horn or tortoise shell.

Many of the figural scales, outside of the design, were pressed very thin. Also, French scales from the early 1800's tended toward the very thin, even in...