All WCF means is Winchester Central Fire. It should be a 30 WCF or a 33 WCF, or something like that. 30 is probably the most common caliber. The old 30/30.
Is the gun nickel plated, or has all the bluing been removed?
That gun has what is commonly called a "button magazine" or "half magazine". Instead of extending the entire length of the barrel, and if that's a 24" barrel that would give your about 8 round capacity, the magazine stops at the front of the forearm, giving you about 4 round capacity. The piece of metal plugging the end of the magazine tube looks like a button on the front of the forearm - thus the name.
Sometimes they stick out a little, like this one.
And sometimes they are flush, like in your picture.