Portret van een onbekende man, aangeduid als Lippmann before 1892

"Portret van een onbekende man, aangeduid als Lippmann" is a portrait by Marco Mendoza, created before 1892. It depicts a man identified as Lippmann with a full beard and mustache, wearing a suit and tie. The portrait is framed within a decorative oval, making it a classic example of 19th-century portraiture. The small size of the artwork, only 75 mm high and 54 mm wide, suggests it may be a photograph or a reproduction of a larger painting, possibly created for a publication or personal use.