Fritz Lang, so a masterpiece of sorts, silent with music and subtitles.
Prize for the best chain-smoking wheelchair villain ever, and his hair. The inspiration behind "James Bond" - the spy-vs-counterspies, and Doctor Strangelove definitely mined a lot of their inspiration from this. As did the John Wick universe - everyone in this film is a spy. Lots of cute symbols - the 24 hour clock on the Villains desk (statecraft never rests); I could go on, not everyone's cup of tea but it's available on YouTube free - and ad free. Good luck finding anything else on YouTube that's 2 1/2 minutes ad free, let alone 2 1/2 hours.
Watch online free (YouTube) here: https://www.youtube.com/watch?v=UrV_oclAGes