Paint color of the style 5 Baby Ben Gunmetal clock.
Early (pre-war): the metallic coat is over the black base coat. Smoother surface.
Late ((post-war): Metallic paint all the way through. Slightly more speckled surface.
Those with back type 4 are unusual - the bezels have the early type paint, and the backs are noticeably more black - very slightly metallic.
