Dom would be 1904, but would be an 1893 instead if in .38-55. There was a grade B with a different barrel roll stamp marked "For Black Powder" with a blued receiver, otherwise "Special Smokless Steel" would be for the regular Rifles with cased receivers. 24" was a normal rifle length with the range running 20, 24, 26, 28, 30, and even 32" Standard was 26" and I dont see a half and half listed just either or but could have been and I just have not find reference of it yet till now. Hope this helps.
