"17th century anonymous" is copy after 1711 painting by Nattier

Bertolami Fine Arts, from Italy, sells on 17 December 2015 a "17th century, anonymous" Joseph and the wife of Putifar, estimated at 4,000 to 4,500 Euro.

It is a good enough copy after the painting by Jean-Baptiste Nattier from 1711, now in the Hermitage, but as a copy (and definitely not a 17th century painting) it isn't worth the estimate.

UPDATE: sold for 3,800 Euro, more than I expected.