This auction ended on 11/13/17. Here are the Prices Realized.
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Sold by William J. Jenack Auctioneers on Live Auctioneers for $6000: the original US Patent Model for the Barnes Swan-On-Swan Sad Iron, patented December 11, 1877. Height 4.5" and length 6.5". The attached note stated it was found in the debris of the Patent Office Fire of 1877.
Prices Realized are posted on Proxibid