Each box contained one of these. After they sold a certain number, they'd have a drawing and announce the winners. As far as I can tell, there were four series. The Second-series, seventh sub-division was around 1862-1865, with a break in there of 1864 when a big lawsuit pretty much stopped manufacturing of the Washington Medallion Pens.
The whole story, or at least as much of it as we know, is coming to my blog in the next month or so. I still need to get a few documents from the clerk of the court's office in Manhattan. They're too fragile for photocopying and so need to be photographed. Anyone in the area want to do me a big favor? Let me know.