To save you link-clicking, here's the recipe. Its text also draws back the mystery of why Coke has referred the formula that supposedly gives the soda its unique flavor as "7X-100".
Fluid extract of Coca 3 drams USP
Citric acid 3 oz
Sugar 30 (it is unclear from the markings what quantity is required)
Water 2.5 gal
Lime juice 2 pints 1 qrt
Caramel 1.5oz or more to colour
7X flavour (use 2oz of flavour to 5 gals syrup):
Orange oil 20 drops
Lemon oil 30 drops
Nutmeg oil 10 drops
Coriander 5 drops
Neroli 10 drops
Cinnamon 10 drops
If you decide to brew a batch, let me know how it turns out!