This is one of a pair of miniature punches and dies that could only be produced with the EDM process.
Both parts are extremely hard toolsteel ; over 60 Rockwell C.

The button is A-2 toolsteel hardened to 60-62 RC and still needs to be finish ground.
The openings are 0.0209″ wide.

This is the mating punch.
Die clearance is 0.0013″ total and the punches are 0.156″ long.
They were cut by wire EDM cutting an electrode, then sinker EDM cutting the punch profiles and orbiting the electrode to bring the punches to size.