I have developed an open sourced resource ( for the old timers, the code is free and modifiable) that works with Numista's downloaded XLS coin list. The fields have changed a lot lately, but I have worked around this. You will need to know Excel and understand some basic concepts before running wild, also this is still in develop mode and nothing is ever perfect. Here is a result,

within a coin half flip. Pretty Eh?
Write me if you want a free copy.
*almost all the code is math