Check ebay. There is a guy on ebay selling very deceptive inserts that are not genuine and identified by the seller as aftermarket. If you see one like yours from this seller, then you'll have your answer. I can't remember the guys ebay screen name at this time but he sells them out of Florida.
Edit - The seller is oldwatchparts in Sarasota, Florida. Here is a link to one of his auctions. Check the fonts on the insert in question to some of his inserts.
https://www.ebay.com/itm/26671353874...Bk9SR47z14zWYw