This circa 1860 campaign pin shows a bust portrait of Abraham Lincoln, presidential candidate. It was listed by gallerybfa on eBay in February 2012.
The seller describes the image of Lincoln as one that "appears to be a salt print photograph of an engraving housed in a 'gem-type' brass oval mat and preserver. The back is made of a single metal plate which is the size of the brass frame with a stick pin soldered to the plate." The pin is approximately 3/4" x 1", excluding the stick pin.
see the original eBay listing
With 9 days remaining in the auction, the price is at $38.55 with 3 bids (reserve not met). The listing is scheduled to end on March 4, 2012.