Also - have you considered vintage?

I don't know if your budget is four figures or six figures!

I'm not in those circles, but how much do you want to spend? I'd suggest, on a general level, going with a brand that has more 'watch world' recognition rather than general public recognition. Also prob depends on national vs int. security or defense or diplomacy. Might differ.

They were replaced by plain cups and a new dial and hand made by Vulliamy when he presented the clock. The names on the clock are in French, and the geographical outlines are those found on the world maps of Pierre Duval, first published in the last quarter of the 17th century.

Those portions of the globe north of the Tropic of Cancer and south of the Tropic of Capricorn are missing on the Society's clock, and with the latter the original dial and hands. These parts of the world might have given precise information for the dating of the clock on geographic grounds.

It is driven off the movement proper of the clock, which also indicates both hours and minutes on a small dial on the underside of the globe. This second-time indication, and the inclusion of a minute hand, make the clock exceptional.

The Society's specimen is a much more elaborate piece, the ball taking the form of a terrestrial globe. The central moving hour-circle is replaced by an hour-band carrying twenty-four skeleton numerals. As it revolves once a day, this band gives a universal time-reading for any part of the globe.

They generally took the form of a plain sphere, around the diameter of which was placed an hour circle. This revolved once in 24 hours, the time being read off the figure of a cherub or other indicating device, as the moving hour-circle passed by.

A limited number of clocks in the shape of a sphere, suspended around a central arbor and driven by their own weight, were made towards the end of the 17th and the beginning of the 18th centuries, mainly in France.