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Originally Posted by Shakethetrees
As a professional metals restorer at work for over thirty years, I've seen a number of these reliefs.
Most of them are BRONZE FINISH, not solid bronze.
Basically a casting is lightly finished and then plated in the manner that baby shoes used to be done. A relatively thick layer of copper is electroplated on to the zinc base. It is then scratched brushed, oxidized, and scratch brushed again to relieve the finish.
They are common.
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Here is a look at the back of the plaque. A close look at scratched and (oxidized?) areas leads me to believe that Shakethetrees is right and the plaque is plated. Maybe you can tell if it is "electroplated on to the zinc base" from the photo Shakethetrees.