The Toven Specimen, or coin as some people refer to it as, is a independently held aluminum 1974 Lincoln cent pattern, one of the 1974 aluminum cents.
It is common knowledge that over a million of these were minted by the US mint, but the Toven Specimen is one of only two known to survive. (The other example is held by the Smithsonian Institution.) It is often alluded that Chief Mint Engraver Frank Gasparro also had one, although its subsequent circumstances are unknown. Several others may have been kept by members of Congress and this as well has not been divulged to the population.
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Check out the Youtube video I have included below which speaks about the same thing and might hold your attention a lot more on this.