Unusual 19th early 20th Century frame with Convex Glass

This really is an exceptional late 19th / early 20th Century frame with Convex glass. Unfortunalely I do not know what this would have originally housed or been used for but as you can see from the images it is fantastic quality.

I have left the frame in its original state but the wood could do with a little waxing which would bring it back to new.