Sikhote Alin Meteorite help?Please?

Hello i just purchased a sikote alin meteorite for 150 dollars. It is a small piece of it surrounded by silver and on a silver chain, so it is a necklace. But i wanted to know how far back the meteor dates back. I know that it hit in the 1900's but i want to know the history of this meteorite when it was in space and before the impact on Earth. Please help me, and thank you. BTW this item is genuine because it did come with a certificate of Authenticity, and i bought it from a collector and the collector lives in Russia, and thats where he got the meteorite, it also comes with a statement from NASA that it has been evaluated and confirmed it as a meteorite.