Is there a point where something is illegal to sell but legal to own or is there a cut off date?

So I was watching pawn stars and this guy brought in a tortoise shell guitar that has been around for a while (they said in the show around 1960s). So they weren’t sure if it was legal.

which makes me think of a old ivory cigarette Holder that my great grandparents got from the Qing dynasty era (probably 1890-1910s I was adopted by the baby boom generation my grandfather was born in 1917) I have absolutely no plans to sell it but I’m wonder if I could even legally sell it if I wanted to or just keep it in the family until the end of time?
Is there a point where something is illegal to sell but legal to own or is there a cut off date?
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