American foot artillery sword?

[Lee]

An inquiry received in my e-mail:

I am of Norwegian descent, my great-great grandfather, great uncle were both in the Civil war. ...this sword was cherished by my father and kept by him for last 87 years. It is difficult to identify because I cannot find a makers mark except for what appears to be a small star on the blade. The brass hilt is not as either the Ames M1832 model nor the M1821 because it does not have the 3, the blade is approximately 18.75 inches from base of hilt to tip of blade. I thought it might be the French but the pattern is different also. I am now confused and wondering if my great great grandfather brought it over in 1822 from Norway, because I understand the Norwegians are great blade makers.

The first picture upon examining with a jeweler's loupe looks like a 2 over 7 on the crossbar of the hilt.