Leonidas and I have traded several emails. We are aware of the dates of the "Franc" notation. I personally think the chips are 18th or 19th century just like you. Leonidas wanted to see a reaction. He wrote this to me...."I dated your bone chip as 11th century and posted it to solicit a discussion that's why I put a "?" marked on the subject of the post. " His interest is peeked. He wants to know as well.