I have never found a Metal Detected Mint Error. I acquired them from other Error Specialists who sell them. These are Metal Detected - Environmental Damage..
Here are the three metal varieties of the Philadelphia Sanitary Fair tokens. The sanitary fairs were fundraisers that were held to buy cleaning and medical supplies for the Union troops in the field. The 1864 Philadelphia fair was one of the largest. The Philadelphia Mint pulled a coin press on the floor of the exposition and struck these tokens there. The copper pieces sold for 10 cents and the silver pieces sold for half a dollar. The gold plated pieces were for VIPs and are fairly scarce. Copper Coin silver Gold plated There are sub-varieties of these pieces with different placement of the lettering on the reverse.
And then there’s this one, a 1982 Washington Commemorative Half. It’s 2 quarters rolled into one coin. Lol, I just had to add this one as it’s such a nice looking coin. It currently resides in my Dansco Album.
I wish I would have photographed the Bicentennial quarter I received in change last night. It looked like somebody began spooning the quarter, lost interest and put it back into circulation. I threw it into my quarter box never to be seen again.... Would have been a funny addition to this thread though.
A couple circulation finds while cashiering back then. I was saving full drum bicentennials. The pics are from a years-ago scan of my Dansco album page. I see I had misaligned the plastic slide on the '76 reverse bottom.