It's simple. Any coin, token or medal with a wreath back reverse. Post yours as well..... I'll go first.
Here's an old one! Roman Empire Aemilian (Jul-Oct 253) Sestertius, Rome Obv: IMP CAES AEMILIANVS P F AVG Rev: VOTIS / DECENNA / LIBVS / S C in four lines within laurel wreath. 14.11g, 25-27mm dia. RCV 9862, RIC 54(a).
I really don't remember how or when I acquired this item. But it's one of the unique items in my collection I think it's brass. It is flat on the back with no markings.
1970 Stone Mountain medal Civil War era mint employee Civil War Oath of Allegiance medal. During this period people collected just about anything with Washington on it. This celebrated the mint employees taking oath, and the mint finding another way to sell more medals. This is not that rare for a medal. The 19th century mintage in copper was 808 pieces, which is lot for a medal. If it were a coin with that mintage $$$$.