Is this the correct crown ?

So I currently have an omega constellation chronometer case REF: 2852 4sc which is gold/stainless steel . on the table and looking for a replacement crown. Ive done a bit of research and searched ebay / a little on here with same reference and the only crown I think it could be is coming back at 5.2mm 069SX42019 which is a decagonal 10 sided I have purchased one off eBay supposedly genuine and unused for £110 in their listing my case reference is there in the description saying it fits but after purchasing ive had a message saying they can’t guarantee it’ll fit ? Just looking for a bit of advice as they don’t accept returns, any help is much appreciated thank you

Thank you