I don't know when it was produced.
It said:
ナスOツ十ナスツオツ ツ渉コヒ彗窶愿アツ十窶扼窶愿アナ椎スツ ナ陳」窶拏窶慊? 窶邸窶板イナス窶コ
37 showa 20 nen 2 gatsu. ken'noutou Houryu-ji
I think that this Katana(Japanese sword) was one of presents from Houryu-ji in February 1945. Mybe to Japanese soldiers for their distinguished military service. (If it was presented to Horyu-ji, probably it would say "窶「テイ窶拏窶慊 hounoutou"... I think)
37 means sequence number of those Katanas from Houryu-ji..., I don't know.
Anyway it's surprised, because Houryu-ji is the most famous temple in Japan. It is the oldest one.