Is the date 1893 correct? From the small section shown it looks more like 1863, but it is possibly a 1893 photo in which he donned his old uniform for a GAR function or the like. He would have been 92 at the time. The sword does not look like a regulation sword. As a general officer serving in staff or infantry positions, he would have ordinarily worn a M1850 S&F or M1860 S&F sword, or possibly the so-called M1851 general officer's sword. (In the only other photo I have seen of him wearing a sword, it appeared to be a M1860 S&F.) The sword shown in your picture is clearly not one of these. To me it looks like a non-regulation German import, but I can't make out enough detail to be more specific than that. .