Conventional wisdom has it that the supply of Old Masters for sale is drying up. Don’t tell that to the participants of the Maastricht Fair. “Once again, exhibitors proved they are still able to find amazing works of top quality across a range of fields. Where else can you see, under one (admittedly vast) roof, two major Rembrandts, a Fra Angelico fresh from a show at the Metropolitan Museum of New York, a Clouet, a whole kunstkammer of amber including a piece from the lost Amber Room at Tsarskoye Selo, an elephant folio of Audubon’s Birds of America, and a throne from the Royal Palace of Warsaw?”