Calculator, world time zone. Universal time finder with circular wooden base and a bevel glass cover. This time finder tells the time differences around the world based on the Paris Meridian. Three cardboard scales. The outer scale has a list of places around the world. The scale in the middle of the dial is the hour scale, marked 1 - 12 in Roman numerals on a blue background. The middle dial has a further list of places around the world. On the underside of the instrument are instructions in French on how to use it.