Appears, and likely to be based on the era, real Copper. "Cu".
Bill.
Yes, an odd appearance
I bought the coin from Ebay, where the description was nice grade with dark patina, the photo seemed to confirm that
seller's picture

On receipt the coin looked "claggy" so a cotton bud dipped in acetone was swiped across the surface - immediately showing an area of lustre!!! - the coin had been lacquered at some time
Photo below is after an acetone bath, viewed in oblique lighting (my original posting was a scan)

David