"Belle de Jour" was Buñuel's first collaboration with Deneuve, and it marked a significant point in both of their careers. The film was shot on location in Paris and at the famous Château de Rochecotte. Buñuel's direction and the screenplay, co-written with Jean-Pierre Aumont and Philippe de Constantin, brought a unique perspective to the narrative, blending elements of drama, eroticism, and surrealism.
"UltraFilms" is not a known studio like Pathé or Janus Films. Instead, the term appears in multiple contexts: ultrafilms maria pie belle de jour 18112 upd
(Note that I assume that UPD 18112 is likely an update or version number, I kept it as it was) "Belle de Jour" was Buñuel's first collaboration with