Welcome to SRP. Your grandpa's razor is in good shape and vintage Bismarcks are fine shavers. The Bismarck razor company was in business from 1900 to 1930 according to Goin's Encyclopedia of Cutlery. Dorp & Voos, which became Dovo, bought them out apparently and continued to use the brand name. The brand name was one of many things from battleships to razors named after the German statesman Otto Von Bismarck who was important in the unification of Germany. Sort of a German equivalent to our George Washington.