@KBBPLL New to me also but I found this The test cut was a readily easy method to expose the "innards" of the coin and reveal what was beneath the coin's surface. Some would scratch the coin's surface while some would cut a large gash as we often see in ancient silver coins So I think someone wanted to make sure the coin was silver, similar to chop marks on Trade Dollars
@GoldFinger1969 Here's the start, I'll post more after breakfast. Note I didn't use the 1959 Lincoln it looked out of place, so I dug into my change bucket and dug out a 1960 D & the 1908 IHC was purchased raw from RCNH.