I am not sure, if it's really wood or something else. I can't either proof or either check it. Feels like plastic for me - or is it this special varnish? The bottom side of the board is definately wood!
But I have the same little dots - unfortunately.
Anyway .. I think, it's a tool ... and a tools will get some marks and spots when time passes and when you use them regularily ....
The pieces are made from wood and pretty nice, especially the velvet (Samt) on the bottom. :-)

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Es ist nie zu spät, eine glückliche Kindheit zu haben