Unique ancien ensemble de plaques murales type lourd années 1880 constructeurs actualités design intérieur populaire

This is a unique and unusual item. Im not sure quite why it was made or who for, I will describe it as detailed as I can.

The back board has fixings for hanging and it measures 47.6cm tall and 35cm wide.

On top of the wood is a base layer of metal and then what looks like onyx.

The plaque itself is indented as if type set but its not reverse for printing. It is basically carved.

It is full of the names and logos of building and interior design related journal titles and companies. There are no dates anywhere but with some research into the various titles and companies, I have pinned it down to the 1880s.

Any questions please ask