This is a lovely box by the very famous firm of Roberson of London and really quite rare. 
It has all of its original 18 ceramic pans and 8 spares again by the maker. These are also ceramic. 
The box is in very good condition although there is one small area of paint loss in the main palette inside the lid. The exterior of the box is really very good. The box is very solid and perfectly usable opening and closing as it should. 
It is also one of the superior types whereby the pans are held in place by spring powered bars so mostly rattle free! This also means it’s impossible to loose the bars as they are fixed to the box. 
There is within the paints one that has never been opened! The pans themselves are rare and sought after being strong and almost immortal!
A lovely thing.