Philippe Blanchard, a colleague who works on medieval Jewish cemeteries in France, contacted me with a question of identification. From a grave in the cemetery of Châteauroux comes a pendant, which can be seen here how it was found.
Unfortunately, it is an iron object that has not yet been restored.
The X-ray image suggests an eyelet at the upper, wider end. The drawing was made after the X-ray.
Due to extreme heat, probably due to a fire during the pogrom on 21.3.1349 in Erfurt, this inscription on a sandstone was severely damaged and is therefore difficult to read. First suggestions for the reading point to a Yiddish inscription like קלטיר קלר (Kalter Keller = cold cellar or Kelter Keller = wine press cellar).
Have another suggestion? See below for more photos and write it in the comments!