- Country: Italy, Spain
- Genres: Crime, Drama
- Release: 1967-02-23
- Director: Michele Lupo
- Writers: Lewis E. Ciannelli , Sandro Continenza , Ettore Giannini , Roberto Gianviti
- Language: Italian
- Stars: Richard Harrison , Richard Harrison , Adolfo Celi , Margaret Lee , Gérard Tichy , Antonio Casas , Eduardo Fajardo , Andrea Bosic , Livio Lorenzon , Ennio Balbo , Luciano Pigozzi
- Runtime: 111 min
- Awards: N/A
- AKA: Coup de maître au service de sa majesté britannique (France, French Republic) , The Great Diamond Robbery (Hong Kong) , Om du lever så skjut (Sweden) , Master Stroke on Her Britannic Majesty's Service (Japan) , Die Doppelgänger , Coup de maître (France, French Republic) , Hua shen da dao lian huan ju jie an (Hong Kong) , Pljacka po nalogu britanske tajne sluzbe , Der Super-Coup der Profi-Asse , Londra soygunu (Turkey) , Master Stroke (United States of America) , Gran golpe al servicio de su majestad británica (Spain) , Meesterslag in dienst van Hare Majesteit (Netherlands the) , Colpo maestro al servizio di Sua Maestà britannica , 女王陛下の大作戦 (Japan) , Kugleregn og diamanter (Denmark) , I nyhta tis megalis listeias (Greece) , Golpe de Mestre a Serviço de Sua Majestade Britânica (Brazil)
- Plot: In Madrid, actor Lang is hired by Monsieur Bernard to impersonate a certain Owen for a time. Lang is trained for his role, that is to replace Owen as the diamond pickup controller at General Diamond in London.
- IMDB:tt0060249
Master Stroke Cast · · · ALL
Michele Lupo
Director
Richard Harrison
Arthur Lang
Adolfo Celi
Mr. Bernard
Margaret Lee
Evelyn
Gérard Tichy
Max
Antonio Casas
Col. Jenkins
Eduardo Fajardo
Mr. Ferrick
Andrea Bosic
Mr. Van Doren
Livio Lorenzon
Miguel
Mary Arden
Dorothy
Vito Fasano
Secret Agent (uncredited)