If you are very rich, you may be able to purchase an Equation watch. They are mostly limited-edition and take years  to make. The makers of these gems, of course, give little detail of their mechanics.
As far as I can see, all simulate the Equation of Time with a single cam.
Further information on their mechanisms would be appreciated.
Left to Right : Click to enlarge : (i) Blancpain Villeret Équation du Temps Marchante (ii) Blancpain Calibre 3863 watch (iii - v) Luminor Panerai Equation watch (vi) Audemars Piguet Jules Audemars Equation of Time (vii) Jaeger-LeCoultre Master Gyrotourbillon 1 and Reverso Grande Complication à Triptyque (viii) Zenith Christophe Colomb Equation of Time  

A nice animation of the development of the analemma and the Equation of Time

Another nice animation

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