Pony Express Diamond Jubilee medal for swap

I picked up this Pony Express Diamond Jubilee medal, and since I don't generally collect exonumia, I thought I would offer it up for a swap. I believe it is one of the "so-called half dollars", originally sold to raise money for the Oregon Trail Memorial Association.

It is 32 mm in diameter, and 13.8 grams in weight. It is made of copper-nickel. There is a little bit of tarnish or corrosion on the top of the obverse, but other than that it seems to be in uncirculated condition, with nice cartwheel luster.

These usually sell on eBay for about $5 to $10, it seems. I could try my luck there, but I thought I would see if there was any interest here first.