Allgäuer, from Germany, sells on 11 January 2018 as lot 1989 a "Painter of the 19th / 20th century" Maria Lactans, estimated at 100 Euro. They indicate that it has an old attribution to Simone Martini.
May 2017. The version for sale is probably later (as indicated by the auction house) and in any case definitely not by the Master of the Gold Brocade; but even so it is a very cheap copy (if you exclude shipping costs and the like when you're not based in Germany). If it would turn out to be 16th century, it would of course be worth closer to 5,000 Euro, but without provenance and seeing only the front of the painting in a photo, this is for me impossible to be certain about.
UPDATE: the Master of the Gold Brocade, estimated then at 100 Euro, is now (19 April 2018) for sale at Christie's New York with an estimate of $6,000 to $8,000, described as "South Netherlandish School, last quarter of the 15th century". Good work by whoever bought this!
UPDATE 2: and it sold for a whopping $21,000, or 200 times the estimate it had 3 months earlier!