What film was did Orson Welles state is the best film I have ever made, and was produced by one of the biggest and most notable film studios in Central Europe?
The Trial
Jadran Film
Jadran Film is a film production studio and distribution company founded in 1946 in Zagreb, Croatia.
 In the period between the early 1960s and late 1980s Jadran Film was one of the biggest and most notable film studios in Central Europe, with some 145 international and around 120 Yugoslav productions filmed at the studio during those three decades, including two Oscar-winning films and Orson Welles' 1962 screen adaptation of Franz Kafka's novel "The Trial".
 The word "Jadran" refers to the Adriatic Sea in Croatian.
The Trial (1962 film)
The Trial (1962) is a film directed by Orson Welles, who also wrote the screenplay based on the novel of the same name by Franz Kafka.
 Filmed in Europe, Welles stated immediately after completing the film: ""The Trial" is the best film I have ever made".
 The film begins with Welles narrating Kafka's parable "Before the Law" to pinscreen scenes created by the artist Alexandre Alexeieff.
 Anthony Perkins stars as Josef K., a bureaucrat who is accused of a never-specified crime, and Jeanne Moreau, Romy Schneider, and Elsa Martinelli play women who become involved in various ways in Josef's trial and life.
 Welles plays the Advocate, Josef's lawyer and the film's principal antagonist.
Vienna (film)
Vienna (also known as Orson Welles' Vienna or Spying in Vienna) is a 1968 short film directed by Orson Welles.
 It was originally produced as part of his abandoned television special, Orson's Bag, which was made for CBS; but in 1969, with the project close to completion, CBS withdrew their funding over Welles' long-running disputes with US authorities regarding his tax status.
 The film remained uncompleted.
 Despite its name, "Vienna" freely mixes footage shot in Vienna, Zagreb, and in a Los Angeles studio.
 The 8-minute segment was restored by the Munich Film Museum in 1999. Around the World with Orson Welles
Around the World with Orson Welles is a series of six short travelogues originally written and directed by Orson Welles for Associated-Rediffusion in 1955, for Britain's then-new ITV channel.
 Despite its title emphasizing the world, it was entirely filmed in Europe.
 Among other incidents in the episodes, Welles visited Jean Cocteau and Juliette Gréco in Paris, attended a bullfight in Madrid (with co-hosts Kenneth Tynan and Elaine Dundy) and visited the Basque Country. Beatrice Welles
Beatrice Giuditta Welles (Beatrice Mori di Gerfalco Welles; born November 13, 1955 in Manhattan, New York) is an American former child actress, known for her roles in the film "Chimes at Midnight" (1966) and the documentary travelogue "In the Land of Don Quixote" (1964).
 The daughter of filmmaker Orson Welles and Italian countess Paola Mori, she is a former model, radio and TV personality, founder of a cosmetics line and designer of handbags and jewelry.
 She administers the estate of Orson Welles. Richard France (writer)
Richard France (born May 5, 1938) is an American playwright, author, and film and drama critic.
 He is a recognized authority on the stage work of American filmmaker Orson Welles.
 His publication, "The Theatre of Orson Welles", which received a CHOICE Outstanding Academic Book Award in 1979, has been called "a landmark study" and has been translated into Japanese.
 His 1990 companion volume, "Orson Welles on Shakespeare" has been praised by Welles critics and biographers. Orson Welles Commentaries
Orson Welles Commentaries (1945–46) is an ABC radio series produced and directed by Orson Welles.
 Featuring commentary by Welles, with reminiscences and readings from literature, the 15-minute weekly program aired Sunday afternoons at 1:15 p.m. ET beginning September 16, 1945.
 Lear Radio sponsored the program through the end of June 1946 when it failed to find a larger audience.
 The series was continued by ABC as a sustaining show through October 6, 1946.
 "Orson Welles Commentaries" was the last of Welles's own radio shows. Orson Welles Show (radio)
Orson Welles Show (1941–42), also known as The Orson Welles Theater, Orson Welles and his Mercury Theater and the Lady Esther Show (after its sponsor), is a live CBS Radio series produced, directed and hosted by Orson Welles.
 Broadcast Mondays at 10 p.m. ET, it made its debut September 15, 1941.
 Its last broadcast was February 2, 1942. An Evening with Orson Welles
An Evening with Orson Welles is a series of six short films created in 1970 by Orson Welles, for the exclusive use of Sears, Roebuck & Co. Welles produced the recitations of popular stories for Sears's Avco Cartrivision machines, a pioneering home video system.
 Five of the films are regarded as lost; footage from one, "The Golden Honeymoon", is known to exist. This is Orson Welles
This is Orson Welles is a 1992 book by Orson Welles (1915–1985) and Peter Bogdanovich that comprises conversations between the two filmmakers recorded over several years, beginning in 1969.
 The wide-ranging volume encompasses Welles's life and his own stage, radio and film work as well as his insights on the work of others.
 The interview book was transcribed by Bogdanovich after Welles's death, at the request of Welles's longtime companion and professional collaborator, Oja Kodar.
 Welles considered the book his autobiography.