This is an Umbrella Gun. Loaded with a ricin bullet that was 1.7mm in size and fired from the tip, it was used to kill Bulgarian dissident Georgi Markov in London in
SOVIET KGB SPY UMBRELLA REPRO WITH HIDDEN POISON SYRINGE
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Bulgarian umbrella - Wikipedia
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Bulgarian writer and defector Georgi Markov
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The KGB Used A Poison-Tipped Umbrella To Assassinate A Journalist | Kyle Schepperley | NewsBreak Original
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Bulgarian Umbrella (replica) | International Spy Museum
Bulgarian Umbrella (replica) | International Spy Museum
Bulgarian Poison Umbrella | German Spy Museum Berlin