Era Identification Challenge

Five blades. Five sets of clues. Can you identify whether each dates to the Koto, Shinto, Shinshinto, or Gendaito period?

Need a refresher on the periods? Japanese sword history walks through the Koto, Shinto, Shinshinto and Gendaito eras, the Tokugawa sword explains how peace changed blade culture, and Masamune shows what the Kamakura masters achieved.