The listing, Beautiful 1923 Peace Dollar Except for a Few Black Spots on Reverse has ended.
This is the last dollar I won in this eBay lot: http://bitly.com/RxDKbk. This one is a 1923 Peace dollar which is nice on the portrait but has some funky black spots on the reverse. According to his post: https://www.kitcomm.com/showthread.php?t=71385, they are common in silver coins and might be removable with baking soda (I didn't try).
Tested as follows:
* http://www.youtube.com/watch?v=5nbPlsWnoUs - ping test. All six dollars from my eBay lot have the base note on the ping or as I did, just drop them on the floor.
* Green silver acid test. My instructions for this green silver acid say if it is real silver, it is supposed to turn grey or milky grey. I scratched the edge of the coin on my testing stone and treated with the acid and it developed the gray and silky gray expected. This silver acid does not start red brown instead starts greenish grey.
* Red brown silver acid test. My instructions for this reddish silver acid say if it is real silver, it is supposed to turn brown if silver is 90%. I scratched the edge of the coin on my testing stone and treated with the acid and it developed the brownish color as expected.
* http://www.youtube.com/watch?v=MiGrtLoJ2dY&feature=relat
ed - using 18K gold acid I also tested the coin. I scratched the edge of the coin on an acid stone. I got the the characteristic blue precipitate suggesting its silver.
* Strong magnet test - no attraction.
* Weight test - weighs 26.8 grams. A completely uncirculated coin supposed to be 26.73. but my scale doesn't go to the 100th gram. This is what my scale registered for my other very uncirculated Peace dollar. I guess it's inaccurate but close enough.
* Plating test - when I scratched the edge of the coin on the acid stone, it showed the same silver color underneath.
Free US shipping. No Canadian or International shipping. (Too expensive.) I 'm not into GINs at the moment. Sorry.