Fox SXS, just to add to Dave's excellent reply. I have two early CE's - one is 1909, and the other 1910. Both of them are only marked C on the watertable.
Interestingly, both guns have the Russell Patent ejectors. The 1910 gun has a very faint marking on the forend iron that is discernible under the serial number area; the serial number is boldly stamped. With a high power magnifier I can read "PATENTS ________ IN F_________". I'm thinking the original Fox & Horne stamping was buffed or filed off and the number restamped.... before it was originally shipped, or as a Fox retrofit, who knows? It does not have the later Russell Patent date on the iron, just the serial number. Silvers