26 Silver plates with flowers and ABC

We have a collection of 26 silver plates in a letterbox. Each plate with a flower and a letter from A to Z.
We knows some information about this collection?
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Do they have any identifying marks?

The markings are very hard to see, but on the front left “Z 1” on the front right “MF 1”

On the back a Circle with a “C” in it and a number next to it (not good readable) but i think “479”.

Sorry that doesn’t mean anything to me, but I think it’s highly unlikely that they are silver as there does not seem to be any sort of fineness standard mark.

It’s Silver.
We have search the internet.
Z1is a dutch marking for silver of the first degree.
We found a year letter C, so we think about the year 1912
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Year C
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Ah, pictures…

That Dutch mark was introduced in 1953. The c looks like 1962.