1.25 inches in diameter. There are people all over Eastern Europe who go around with metal detectors on battlefield sites of The Second World War, as well as areas that were made into ghettos, and former Jewish villages. This was found in Poland. I had to get it, because of the date of 1939 that is engraved, it's just too remarkable (shortly after German forces conquered Poland in late 1939, the rounding up of Jews began). I can make out some of the Hebrew, which says "To Yosef Miltzki for his excellence on (unreadable) the sixth (Roman numeral, referring to the unreadable word), 1939. I think it says "Bazzar" in Yiddish. The reverse refers to a school section or school contest. A Holocaust museum might be able to track down who Yosef Miltzki was, although his fate was likely tragic, as of the 3,300,000 Jews that were living in Poland before the war, only 300,000 survived. Gauranteed authentic, original artifact.