鐵櫻丸 祝喜?(most likely a variant of 寿)
唐津市有志一同
Tetsuō-maru, Celebration of 77th birthday
From everyone concerned in Karatsu city.
鐵櫻丸 Tetsuō-maru would be the name of the sword. Maru is sometimes used for swords, not only for ships or boys. For example, the Japanese name of Frodo's sword Sting is つらぬき丸 Turanuki-maru in The Lord of the Rings.