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.
SOME OF THE GREAT POCKET WATCHES
None of those below used computers in their design
Breguet No. 160 Grand complication, more commonly known as the Marie-Antoinette or the Queen, started in 1782 and completed by Breguet's son in 1827
Breguet & Fils, Paris No. 2667 - 1814
Breguet & Fils, No. 217 - 1800
Patek Philippe - Henry Graves Supercomplication - 1932
George Daniels - Space Travellers’ Watch
Click to enlarge and read caption 
SOME MODERN EQUATION WATCHES
All of those below used computers in their design
Breguet - Marine 5887
Blancpain Villeret Équation du Temps Marchante
Blancpain Calibre 3863 watch
Luminor Panerai Equation watch
Luminor Panerai Equation watch
Luminor Panerai Equation watch
Audemars Piguet Jules Audemars Equation of Time
Jaeger-LeCoultre Master Gyrotourbillon 1 and Reverso Grande Complication à Triptyque
Zenith Christophe Colomb Equation of Time
Click to enlarge and read caption 

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

Another nice animation

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