What do these hallmarks mean? Also, what are these little plates used for?

[Jologan]

Anyone that can decode these hallmarks for me? Thanks ! Are these silverplate or could they possibly be sterling? Thanks

 

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[Mud Hut]

This is your mark I think. I believe those would be considered dessert plates.

 

[tamrock]

They look like silver plate over copper to me. I think I'm seeing copper in the monogram and in worn off areas on the edges? They do look old like something from the 2nd half of the 19th century imo.

 

[nhbenz]

I believe they are butter pat plates (but you didn't mention the size).
There appears to be copper peeking through, which indicates they are plated.
edit: Oops, Tamrock explained the copper while I was typing, I didn't mean to be redundant.
I agree about the general timeframe. These reached their peak in popularity 1890-1910, after which dinner service sets were simplified, with these being left out.

 

[Mud Hut]

They look like silver plate over copper to me. I think I'm seeing copper in the monogram and in worn off areas on the edges? They do look old like something from the 2nd half of the 19th century imo.

Another graphic that will help: