This engraving looks like it was executed by Rudolph Kornbrath or Arnold Griebel. The background is lightly removed and the engraving has vines in a floral arabesque.

I've seen pieces done by these early Masters and their work was fine and not bold or sculpted to the degree of the more contemporary engravers.

I worked for S&W as their Master Engraver for 25 years and seen some outstanding examples, this is one I'd put in that category.