This is an unusual wall plaque from DURON. The image of the plaque was taken from a web sale some years back, so it is clearly “in the public domain’, yet the design application held in the British Trade records at the National Archives in Kew state that the application was abandoned along with 6021 and 6023. There is also no record held of the original design that was proposed.
Note: curious that there is no 6022 product code I have found to date!
If you have one like this, is the colouring the same as the image? Do let me know.