The pendant closely resembles one worn by Frank, researchers said, pointing out both girls were born in the same city.
Yad Vashem experts determined that the only other similar pendant known to exist was owned by Frank, and this one may have belonged to a girl named Karoline Cohn, who was deported to Minsk, Belarus, from Frankfurt, Germany, in 1941. On the reverse side, it features the Hebrew letter hei, used to symbolize God's name, as well as three Stars of David.
It was found in the area "where victims undressed and their heads shaved before being sent into the gas chambers", Yad Vashem said. Researchers are now questioning the possible relationship of the pair and are now trying to locate living relatives of Cohn's to see if she was somehow related to Anne Frank, reports RT.com.
Among the articles found in foundations where a building once stood was a pendant bearing the date of birth and hometown of a girl who would have been a teenager at the time, the Yad Vashem Holocaust Museum said in a statement Sunday. He said there is a Cohn branch on the Frank family tree, but it does not appear to be same Cohn family.
Archaeologists found various items, including jewelry and watches which have been buried for more than 70 years.
"This pendant demonstrates once again the importance of archaeological research of former Nazi death camp sites" Israel Antiquities Authority archaeologist Yoram Haimi told Yad Vashem. Researchers are now trying to locate relatives of the two families to further explore this avenue.
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The pendant is believed to have belonged to someone called Karoline Cohn.
The Sobbor site that is being uncovered by researchers was the site of more than 250,000 Jewish deaths. "Every time we dig, we reveal another part of the camp, find more personal items, and expand our knowledge about the camp".
The Sobibor camp, in eastern Poland, was closed and bulldozed with earth by the Nazis after an uprising in 1943 but archaeologists have been excavating the site since 2007.
The silver pendant was unearthed at the Sobibór extermination camp, where some 200,000 people were killed between 1942 and 1943.
It is part of an global project to build a new museum and memorial at Sobibór, in coordination with Yad Vashem's worldwide Institute for Holocaust Research. Researchers state that these items play an important role in keeping the stories of the holocaust alive.