... Registered Trademark of the company that invented it in 1866; Xylonite Co.

The filigreed overlay plaques carry a few attributions from Monaco, to Elysée Palace-Vichy to South Africa and other locations within France.

Research tells us that this type of manufacture was introduced in the early-30s by B&G...

David Spragg had an attribution that he posted a while back that seemed accurate... Perhaps he'll chime in here...

JB