According to the functional description, Bernd is right: A buzzer is a flat, usually round or oval plate with two holes through which a string is threaded. If you twist the string and then alternately pull and loosen it, the plate begins to spin rapidly, creating a buzzing or humming sound due to the air turbulence.
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Jan 11.10.2025
One alternative: a soldier's makeshift button. Another alternative: a decorative element from a necklace. Or a half-finished product? What do you think?