“O.N.B.” is stamped on the bolsters. This company was owned by the Kastor family. Nathan Kastor was in charge of the factory. The factory was in Ohligs-Solingen, Germany. They made many knives for import to the United States. A. Kastor & Brothers of New York City was the principal importer. In 1938, the Nazi leadership seized the factory.
c 1896-1938