What proof marks are on the gun? That should give you a good idea if you know where the companies are located.
Found this little tidbit
here
MARKINGS: "Charles Daly" on each sidelock; crown over two crossed pistols (Linder trademark) on bottom of each barrel ahead of the flats; "Charles Daly Fine Damascus Barrels" on rib.
I'm sure sauerfan will get you the right sauer markings for those guns so you can tell which one.