For whatever my opinion is worth, and without recalling the various details recorded in Andy's article; the Grade 2 gun featured several engraving variations over the course of it's production. The earliest versions lacked game scenes and featured flourishes of scroll only on each lock plate. When game scenes were added to the Grade 2, the Grade 2 featured a single bird on either lock plate; and the earliest examples of this engraving variation featured those birds in a circle, while later versions of the Grade 2 featured a single bird without the circled border. Don't know why the circle border was eliminated, but supposed it was simply to show some degree of change in the grade so that the pattern didn't become stale (subtle changes in engraving styles were common in the various grades of pre-13 Smith guns). Most bird scenes I've observed on the Grade 2 gun featured a quail on one lock-plate and snipe on the other; but ducks are also occasionally seen, and other bird species and combinations were likely used also as the Grade 2 was not a stock item, but was ordered on customer request. Some times the bird scenes on the Grade 2 gun made absolutely no sense as regards gun gauge and theme, as I've observed quail and snipe/woodcock engraved on two Smith 8-bores. I wouldn't think, at least to the knowledgeable Smith collector, that the engraving on your gun would add any additional value to the gun because it's more or less standard for the period in which your gun was manufactured. If, on the other hand, your gun had been engraved in the early Grade 2 "scroll only" style, a collector would find yours to be a very interesting variation because that early style had been discontinued long before the 1907 introduction of the Smith 20-bore. To captivate a collector's attention, the engraving format would really need to be something very odd such as the Monogram Grade Smith gun I once observed that exhibited standard Monogram features and quality in every respect except that it featured what was basically Grade 2 engraving; a single duck or goose on each lock plate with small amounts of line and scroll work. It was so unusual that I wanted it badly; but lost out to the guy at the front of the line.