Adding my "Congrats" too. The Model 54 in 30 WCF was made only from 1927-31 and is uncommon. In my own opinion, between the carbine and rifle editions, the rifle is also less common! Yours looks good and including the less often found double flat-folding flat leaves - if that's what I'm seeing. Typically such leaves are either loose & floppy or exceedingly tight due to minor corrosion! The one photo I can't understand is of the action right side which "appears" to show a large - perhaps gas relief ' hole in the extractor and presumably only making sense, corresponding through the bolt body in corresponding location. Is there a hole, or??? I'm also unsure of your receiver sight which I, first glance, took as a modified Lyman 48, but now think perhaps a Pacific Model? You don't show the receiver from atop. Hopefully no scope holes which would not have been original and would significantly affect the collector value!
Below pix of my similar rifle dating to 1930. Only one such 30 WCF rifle as I have three carbines, two of which are original. Mine's wearing a Lyman 48, believe 2nd Model aperture. These were sweet guns and the aside of particularly uniqueness as the receiver was designed by Winchester specifically for that .30 WCF chambering. The immediately to be noted difference from every other Model 54 factory chamberings is the lack of clip slot in the receiver bridge.
I've enjoyed the entire line of the Model 54. Last several years of production, it was "updated" with an NRA inspired American traditional stock replacing the European Schnabel style and a svelte barrel integral forged front sight replacing the sight in our rifles here. The 30 WCF rifles existed only in the Euro-fashion and something of post front sight.
Best!
John