Attractively toned 1843 half dollar
Almost all ancient and most modern coins tone blue. USA silver mostly tones gray, i suspect because till the 20th century the metals used in the alloys were not closely monitored for purity.
Tho not obvious in these original dealer photos, this one has quite a bit of blue toning in it, esp in layers on the obverse where someone touched the surface at the bottom when it was new.
Now has alt layers of med gray/blue where a fingerprint once was.
In person it is very attractive :) and a nice xf. I put it in an "Airtight" brand half dollar container to protect it.