The time line for the 1912 to 12 roll stamping change was mid-1919, one of WRA's many "running changes" - w/o the sn- which are not 100% accurate anyway, especially following the semi-chaos of the post WW1 production era at WRA--!! the black diamond inset, and the pigeon for the pigeon grade at the top rearmost upper receiver section is correct-for 1918, also, the first series - aka- old milled style ventilated ribs were not available until about 1920-21 era- so the solid matted rib is also correct--
I also agree with the Gough- as his style was the deep incised favored by many engravers who did the apprenticeship with the 1880-1900 era "masters"- yes, it is my understanding that Mr. Gough was employed by AH Fox Gun Co. in Phila- then left to work for WRA until about 1918--I am not a "Foxist" but if you were to pose this question on their collectors assn. forum website thingy-and asked for examples of the early "graded' Fox guns as engraved by Mr. Gough- and then could compare that with the same grades done later- in the late 1920's- you would see the difference.
No Jap company or engraver could do this kind of work- they can copy- look at their 'iron-on" engraving on the Parker repros and compare- if you dare- that to the engraving done on the pre-1913 LC Smiths or DH(E) and up grade Parkers built from 1890 to 1925, just to pick a few reference points-
Your M1912 is original, scarce, and not only a treasure- but you can actually shoot and kill birds and clays "tombstone dead" with it, and so can you grandson, should you have one and care to leave it to him. Please don't even consider selling it-

