I just found this article, and I thought it was cool: https://www.livescience.com/17821-kosher-bread-stamp-discovered.html. The link says that during the Byzantine Era in Horbat Uza, Jewish bakers of kosher bread would stamp their baked bread with a menorah in order to indicate that it is kosher, sort of like how the Byzantine Christians, even to this day, stamp their prosphora loaves with crosses. The link doesn't say whether the menorah stamp was used for leavened or unleavened bread.
I am wondering if this is still done, or if it was just done in the past as a way of differentiating Jewish kosher bread (marked with menorah stamps) from Christian Byzantine prosphora (marked with cross stamps).
If this is still done, where do they sell these menorah kosher bread stamps?