Cuxhavener Auktionshalle, from Cuxhaven, Germany, sells on 29 October 2016 a "Jan Frans Beschey" portrait, estimated at 280 Euro. At the time of writing, it had already gotten 5 bids and was now at 530 Euro.
Jan Frans Beschey (1717-1787) was the youngest of the 4 painting Beschey brothers, and probably the least well-known. Balthasar, his teacher, is the most common name of them, the other two (Karel and Jacob Andries) are fairly obscure. . His name is also given as Jan François, Jean François, and Jan Franciscus. He worked for most of his adult life as an art dealer in London. After his death, a collection of 250 artworks was sold in Antwerp.
Christie's in 2003 for $1,600, and the other is only attributed to Beschey (and seems more caricatural than his other works), and is kept in the amusingly named Royal Mineral Water Hospital.
UPDATE: sold for 1,250 Euro, some 5 times the estimate.