Here is how I made my own replica coins.
Step 1 - Casting
Use a molding material of your choice (I used Super Sculpey) and press your piece into the material.
Step 2 - Prep Molds
Set your molds on a level surface and coat with a release agent (I used a spray).
Step 3 - Casting Material...
I never did like the plastic "pirate coins" you could buy in bulk so I decided to try and make some that looked a bit more real. Here are my boring coins I cast over the weekend that actually turned out halfway decent.
40 down, only 3000 more to go!
As promised, here is the How-to!