please be so kind as to sign all posts with your first name plus an initial, as is requested here on the NMB board.
As you wrote, there was some info on it in the display. I am curious what was written there?
The sword seems to be an EFU no TACHI, but in a variant with a phoenix (HOO bird) as pommel. These TACHI were used for ceremonial purposes at the Imperial court. There are old originals up to rather new ones made as late as the 20th century, and they were even sold to wealthy tourists.
As usual with Japanese swords, there was not one maker, but every single part was made by a specialized craftsman. Of course, the swordsmith was the most important, and the value of the whole depended largely on the quality of the blade. Many later EFU no TACHI were only decorative items and had very simple blades of no artistic value.
These TACHI are not reallly rare, as far as the later ones are concerned.