Description
These plaques are of metal and the paintings are either painted on the glass or the glass is simply a cover over the painting. It's hard to tell which as I can't open the plaques. Each plaque has the name of the Royal Residence at the bottom of the painting.
The metal is non-ferrous and looks like brass. The plaques are fairly heavy.
There are no makers marks on them. At the rear of each plaque is a short threaded bolt so presumeably they originally bolted on to something.