Korona Rossiyskoy Imperii, ili Snova Neulovimye (1971)

Third film in the Neulovimye mstiteli (1967) trilogy. This time the action is set in 1923/24 and the heroes Danya, Yasha, Ksanya and Valeri have joined the Cheka and take an active part against White Guards who have stolen a royal crown of great value from a museum.