Despite years of searching for that Yiddish-text button, including contacting people who have collected old Jewish buttons for longer than I have been alive, the Yiddish button pictured on the handbill is nowhere to be found; it is entirely unknown.

Source: https://www.jewishpress.com/sections/features/features-on-jewish-world/the-button-of-tears-and-blood/2023/07/28/