Robuta

https://www.christies.com/lot/lot-otto-karl-knaths-black-face-clock-6013369/?from=salesummery&intobjectid=6013369

https://www.christies.com/lot/lot-karl-knaths-rye-bread-5290704/?from=salesummery&intobjectid=5290704

https://www.christies.com/lot/lot-otto-karl-knaths-still-life-of-a-5040231/?from=salesummery&intobjectid=5040231