I probably spent the last couple of months doing research, this is about coin collecting and I thought it would be interesting to have an actual checklist for every coin that has ever existed in the United states, pennies, nickels, dimes and such, and from what I've seen on the internet nothing really comes close to something like this since this is pretty much everything that has existed up to the year of 2014 since the start of coins created in this country back in the late 1700's