Castor Hara Drouot, from France, sells on 9 March 2018 a "Dutch School, 17th century" Adam and Eve, estimated at 1,000 to 1,500 Euro.
Dorotheum in 2016 for 54,000 Euro. While the Dorotheum version is clearly better, the price difference is still huge and getting the one for sale now for 1,000 Euro seems like quite a bargain.
Dorotheum on 23 October 2018 as a Jacob de Backer! Certified by Klaus Ertz, who isn't really a reliable authority any more, but still a nice upgrade from my "copy after". The work has been cleaned and is now valued at 15,000 to 20,000 Euro, which seems realistic. Of course they don't mention the provenance, which really is a lost art at auctions.