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Message:: [QUOTE="bhp3rd, post: 838292, member: 16510"]This is a little simplified but a good start for you. # 8 and #7 mean nothing for most practible applications. #8 has nothing to do with the coin and #7 we will leave on the table for now.# 6 is very rare in the same context as #5 and the two are often confused and generally the same when people refer to them.  Strike doubling is most often just a die bouncing or in effect slipping (flopping) of the dies.A true doubled strike is much more rare than the above esp in modern times.It's #2, #3 and #4 that we are mostly concerned with here.All dies were hubbed mulitible times prior to about 1990 and it was during this process as you say, that incorrect hubbing can occure.There is at least 8 classes of doubling connected to the die/hub making process and one class of "god knows what" type of doubling. This is not an easy subjest to understand and you are off to a good start.I wish (oh you don't know how I wish) that others would take time and ask well thought out question and work a bit to understnd this better as they go. Get a couple of true doubled dies in mint state and study them.  Get some reference books such as Cherry Pickers, Fivas/Stanton and The Error Coin Encyclopedia, Margolis, The Authoritive Reference of Lincoln Cents, Wexler First step is learning to ask good questions and learn how dies were made and are today.[/QUOTE]