OK so I don't usually do this, but was listening to the Tested podcast Still untitled with Adam Savage today which was about John Wick and Adam mentioned about trying to get the coins.
I loved the film and by trade I'm a Silversmith, Goldsmith and Jewllery designer maker and though I would have a crack, found this post and have been checking out all your resources you guys have discovered, which led me to start 3D modelling my own.
From looking at the pictures I could determine that the coin was made from different research sources and such as the euro coin with the bow and wreath surrounding the lady. so after doing some google searches I've found this, along with the beginnings of me modelling the coin.
The woman on the back is lady freedom but holding the star-burst shield on the front behind the lion with a sword, she is holding an olive branch which makes sense of the olive branch surrounding her tied in a bow.
Just need to make out the text above her and I am about half finished!
Looks like it might say "Ex Unitae Vires," which I think is meant to be "Ex Unitate Vires," which means 'From Unity Strength," and which used to be the motto of South Africa; which might make it a tip of the hat to Krugerrands.