Could you post a close-up or two of the engraved bits, especially the fruit? Looks cut to me, judging by the shading, and the shapes of leaves. Stevens and Williams often used motifs somewhat similar to that central one, but I don't know if that's significant. Odd shape to have so prominent within the other more mundane parts of the design. I wonder if it could be a trademark of a brand of biscuits or something.