Claude Monet 
(1840 - 1926)

In the same summer Monet also painted a portrait of Manet at work “en plain air”.
Sadly only a poor reproduction is available online, because nobody knows where it is.

Claude Monet’s Manet painting in Monet's Garden, was owned by the German Jewish artist Max Liebermann and his wife Martha. The painting was confiscated from the couple’s apartment at Pariser Platz 7, Berlin, in March 1943 after both Max and Martha’s deaths.
The painting, which Max Liebermann had bought in 1898, has not been seen since it was in the Liebermann apartment. It is suspected that the Nazis sold the work after its confiscation.

https://www.monumentsmenandwomenfnd.org/wwii-most-wanted/monet/manet-painting

Manet painting in Monet's Garden in Argenteuil.
1874
Oil on canvas
41 x 68 cm
Private collection