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Rhett Yeakleyas was stated they are PX3 Double Header Discs, you were encouraged to "Add #1 to #2 and make a Double-Header" I believe they were a Gum Inc. issue. I have seen a wrapper for the issue, but they (the wrappers) are EXTREMELY scarce. Those with #2 at bottom are slightly smaller in diameter than those with #1 and fit inside the #1's. Thus I have found #2's are usually rougher as their paint around the outside has been worn putting the disc inside the other.
Here are a few more, they came in a wide array of colors.

Obviously today people would rather have them as singles as opposed to "coins" so you might want to seperate them. This can be difficult, but I have had success using small suction cups on each side and pulling them apart. This will work unless there is any oxidation that has occured.
-Rhett