According to Rick Snow, noted Flying Eagle and Indian Head Cent expert, "One of the main points that show that the Snow-3 is a business strike is that many show strike-doubling. You will find that this happens on the steam press, but not on the screw press that the Proofs were struck on. Many of the Proofs are terribly made, granted, but a high Proof mintage (1500 - S9's) will have quality issues."