Hi welcome to the forum,
Yes, I believe it to be for John Gilbert and for information about John Gilbert see;
http://www.925-1000.com/silverplate_G.html
and:
http://www.silvercollection.it/electroplatesilverG.html
The handles, ivory colored, could have been made of synthetic material(celluloid) to imitate ivory called faux ivory but hard to tell by looking at images. Synthetic substitutes for ivory have been developed. One imitation ivory is made from cellulose nitrate and another from casein (the phosphoprotein that accounts for nearly 80 percent of proteins in milk and cheese) (MFMHS). In the late nineteenth century, faux ivory was commonly used, and known as Genuine French Ivory, Indian Ivory, Ivorine, among other names (MFMHS).
For more information about artificial ivory or imitation ivory see:
http://www.realorrepro.com/article/Ivor ... -confusing
Oel.