Specimen
From its earliest days, the US Mint has occasionally produced coins that fall short of the definition for actual Proofs yet are clearly superior to the normal currency issues. In past generations, such pieces were routinely described as Proofs by coin dealers and catalogers. Since the 1960s, these would-be Proof coins have gradually become accepted under the term "Specimen," which is abbreviated SP on the certification label...
| 504278 | 2010-P $1 Weak Edge Lettering Buchanan, Pos. A, Satin Finish Edge Error | SP + | 1 SP68 |