I agree with Crazyb0 that it is a very good and nice example of Machine Doubling. You should keep that one so you can eventually differentiate between a real Doubled Die vs a Machine Doubled coin. For Doubled Dies, devices increase in size. Machine Doubling reduces the devices size and is shelflike (flat). What you need to look for on Doubled Dies is extra thickness, notching, separation lines, and the matching die markers. Hopefully, this will help you out in the future coin roll hunting. Just remember what I said to look for on Doubled Dies and you will become a master eventually. Great outstanding pictures by the way.

Errers and Varietys.
























