European film of the 70s

a Polish or Czech film from the 1970s in which the protagonist lost a painting and was forced to hide by disguising himself as a woman

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Maybe? It is a Polish comedy from 1973.

Short IMDb plot summary:
”Falsely accused Warsaw art museum assistant goes into hiding as a woman.”

There is an other, longer, more detailed plot summary on the movie’s IMDb page, see the “Storyline” section.

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