It is the object where the new technology of metal bluing was elaborated - it is "chemical bluing". None of the coating whether it is paint or ink did not give such an effect as "chemical bluing". Black sheet metal became cozy and "interior" having saved the metal color vividness with traces of discolouration.
Sliding partition of oak though it looks massive doesn't require extra effort when opening.
Black metal, rosewood, tick, leather