![Proof Specimen Imperforate single, a large example, [60], handstamped "SPECIMEN" (DS3). Rare and believed by the owner to be the only recorded example. Photo](https://www.christies.com/img/LotImages/1999/SKS/1999_SKS_01223_0554_000(115343).jpg?w=1)
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Proof Specimen Imperforate single, a large example, [60], handstamped "SPECIMEN" (DS3). Rare and believed by the owner to be the only recorded example. Photo