[fred cook]

If I remember correctly, there were grades 00, 0 , 1, 2, 3, 4, 5, 6, 7, Pidgeon, A1 and A2 between 1895 and 1912. From the fact that it is engraved, it is not an OO, O or 1. The Grade 2 engraving was a circle on the sideplate, the Pidgeon grade was a pattern without a circle or oval and starting with grade 4 the oval was larger, taking up almost all of the sideplate. I am not in any sense an expert on LC Smith shotguns, but you will have to tell me why you think it is other than a grade 3 gun.