Interesting Winchester stock

[RCS]

This Winchester no-trap stock received a second proof firing stamp, the WRA WB cartouche was obliterated. There are no
other markings on this excellent condition stock except the second proof stamp and the stock still remains in the no-trap
configuration.

[Jersey Devil]

Please educate me. What are the distinguishing characteristics of a WRA WB stock without being able to see the cartouche? What differentiates the early, unmodified WB from the RS??

[RCS]

The WRA RS stock has the same trigger recess as the SA SPG stock and the same curve to the pistol grip as the SA SPG stock

photos show some WRA RS stocks (they are also no-trap) note the trigger guard recess is like SA SPG while the front barrel
channel is Winchester.