poster featuring a Great Western Railway bus, Wales

 

Age uncertain, but according to this webpage, "Horse-drawn vehicles and early buses and vans were originally all-over chocolate, with black canvas tops where relevant and lettering in either white (canvas) or gold (bus sides).
"The two-tone chocolate and cream colour was gradually introduced to both horse-drawn and motorized vans and buses, and was fully standard from 1923 onwards. This featured cream canvas tops and panelling above the waist-line, and chocolate below."

However, the bus in the photo, dated 1907, looks the same type as in the poster.