Back to the original question, the 20-gauge was only added to the Baker line after H&D Folsom Arms Co. bought Baker. A Paragon of the Folsom era was like this, not at all like the Baker Paragons prior to 1909 --
Around 1909, the Baker Gun & Forging Co. began introducing new models. They still and a Standard Paragon --
And, they also introduced a Baker New Paragon Grade--Model Nineteen-Nine --
By the next Baker Gun & Forging Co. catalogue I have (circa 1915?) the Paragon looks similar to the one offered in the Folsom years after 1919.