The item is a document that is described to be signed by Russian composer Igor Stravinsky. 

It was auctioned off by RR auction and then authenticated and slabbed by PSA. Here are links to it. 

https://www.rrauction.com/auctions/lot-detail/345831806430591-igor-...

https://www.ebay.com/itm/126270186310

I felt the handwriting and autograph is totally different from Igor Stravinsky's when I first saw it. Then I found an example from History For Sale, which is a letter signed by Igor Stravinsky and Vera Stravinsky, who is Igor Stravinsky's wife. Vera written the main part of the letter and Igor signed on the bottom. 

After comparing it to the one of the beginning. I believe the first one is written and signed by Vera Stravinsky, not Igor Stravinsky, because the handwriting and signature matches very well. I'm not a Stravinsky expert but I think the conclusion is easy to get.