Ravensburger manufactured this beautiful puzzle in 1986. The title is The Luncheon on the Grass, by Édouard Manet, although the title in the box is Breakfast Party.
The puzzle is COMPLETE, as you can see in the pictures of the puzzle assembled. The pieces and the box are in excellent condition, with very minor shelf wear on two corners of the lid, and a small tape mark on the side.
It measures 69.8 x 49.8 cm. The reference number is 15724 2.