GTs58
I'm the Wiz, and nobody beats me!
If you wanted a nicer looking chain guard, here's what I would do. Get a nice 59 guard and completely redo it and save the original as is. But keep in mind, there were two possibly three different variations of the 1959 chain guard so get one that matches the stamping on yours. The differences are in the absence of the tab or smaller tab that's bent in at the rear of the radius for supporting the guard. Here's the first issue of the new 59 guard with no bent in tab.