Portrait of Gerhard Dumbar Gerhardus Dumbar (title on object), knee-piece by Gerhard Dumbar at the age of 49, sitting in a chair at a writing table in front of a curtain and a bookcase. On the table in front of him paper and an inkwell, in his hand a goose feather. Under the portrait are name and information and an eight-line verse in Latin., Writing accessories, study, 'studiolo', library, Gerhard Dumbar, Jacob Houbraken (mentioned on object), Amsterdam, 1730, paper, engraving, h 338 mm × w 217 mm