The excavation discovered for the first time evidence of Jewish daily life in the ancient city, including part of an oil lamp decorated with a nine-branch menorah, limestone vessels used by Jews for ritual purity, and a watchtower. The site, dated from the early first century CE to the Bar-Kochva rebellion of 135, contains hidden underground passageways that were used by the Jewish rebels.The menorah decoration is one of the earliest surviving depictions of a menorah. The Jerusalem Post says it's the earliest, but that isn't clear. The one on the Magdala Stone (see here for a photo) is of a comparable date and could be earlier. Note that the one on the Magdala Stone has seven branches, which implies that it is a depiction of the menorah in the Temple.
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