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This crudely cast copy likely dates back to the late 1960's or early 70's . Many rare and common coins were replicated (R=Replica) during that decade. Replicas like this were typically sold at tourist sites, among sets of early U.S. colonial pieces.
The celebration of the 100th anniversary of the Civil War, 1861, much fueled the production of cheap replicas. History buffs were then coming out of the woodwork, and the market for replicas of many vintage collectibles boomed through the bi-centennial year, 1976. Many historic sites continue to market coin replicas, today.
Note that the crude manner of striking gives the OP's replica an aged look ... to the unschooled eye, that is.