Good morning, nice cat eye, more likely 1960's. Look at the green and you might see sparkle. That would be aventurine if it is in the marble.....Joe McDonough
That marble was probably made during the last century. A popular toy with children. A date? It's made of sand that is millions maybe billions of years old! Yeah it's repurposed oldness! Congrats! A true marble expert could probably help you guess. I love finding those! It's neat to think that a child played with it and experienced joy with whatever they did!