Skippings Fine Arts has dated this piece to the 1920s.

The landscape presented here, painted around 1920 or even a little earlier, is a wonderful example.
An oil on its original canvas, our painting measures 65 x 54 cm. Visible (stable) vertical craquelure leads me to believe that the canvas was once rolled and then re-stretched - which makes perfect sense, if it was painted by a foreign artist visiting Italy, who thereafter took it home.
Unsigned on the recto, it is annotated "H de Waroquier" in an old hand on the verso. This attribution is far from absurd, if you look at de Waroquier's early work.
The artwork is presented in a frame that has certainly been with the painting for the last 50 odd years. It is a little tired looking, but of good quality. The overall framed size is 77 x 88 cm.
Skippings Fine Arts has dated this piece to the 1920s.
Modern french & continental pictures selected by a former french auction house expert
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