The object in the image is a rare vintage silver-plated French-style napkin and knife holder, likely made in Italy by Leonard Silverplate.
This type of holder is designed to neatly display napkins and often includes slots or rests for knives.
It features decorative elements, such as the prominent shell-like motif, typical of French or Italian design aesthetics.
These items are often considered collectibles due to their vintage nature and craftsmanship.
Similar items can be found on online marketplaces specializing in vintage and antique goods.