Hi,
Welcome to the Forum.
The pieces that you've shown appear to be of monoblock contruction, that is to say, that they are made it one piece and not a blade and handle joined together. Such pieces are often made of a nickel silver alloy and are not plated, the colour that you see is the same the whole way through, so wear will not show.
Should the manufacturer prove to be Simmons Hardware, then here's a period advertisement from them:

Simmons Hardware Company Inc. - St. Louis and New York - 1912
Trev.