what you have is a beautiful (!) Sauer model VIIIE (a model VIII with ejectors) made around 1911 approximately. Can't give a ballpark figure about the value, but your gun is really one of the better Sauers and it seems to be in good condition.
Thanks for you reply Martin. This gun really is a peach. For a collection of over 38 double guns including half a dozen parkers, half a dozen LC Smiths, an AH Fox, 4 or 5 Sterlingworths, an Uncle Dan Levfever (which is a jewel also) and some unfired superposed gusn.... this one is definately the standout. Locks up tight as the day it was proofed. Only other one I've seen similar to this was much more deeply relief engraved with gold inlays and had a scallopped receiver and side clips. We sold that gun at the shop I worked at in SC and I think we got over 4 for it. This gun is actually in better shape though and it seems that the value of it doesn't preclude it from actually being hunted with either (cause what good is a gun you don't shoot!).
You know, some people spend way too much time thinking about killing ducks.