Might try a new framing hammer
On a more serious note, I don't believe its a specific tool but the shape of the striker on the press used. I've seen it done with a smooth striker that produced a related smooth head. Think its like a 10,000-20,000 lb press
If you do a search you should find one or two people that will do the rivet replacement for you
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Jeff Speegle
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MCA Shelby Judge, SAAC & Team Shelby Judge (in no particular order