That is correct. They can be "mistakes" but not technically mint errors. A "variety" is an alteration or flaw on the actual die which is then transferred to a coin after striking. Every coin struck with that die will feature that same alteration/flaw until the die is replaced. Doubled dies, die cracks, repunched mintmarks, the 3 legged Buffalo are all "varieties." An "error" means there is a problem with how the coin was struck or there is a flaw with the metal. Double struck, off-center, a blank coin, a missing clad layer, an unplated cent, a coin struck on the wrong metal or on the wrong size planchet, etc.
And I would argue with that as well. Doubled dies and RPM are varieties (because they are on every coin from that die), die cracks and the 3 legged buffalo are die stages not varieties. The same die struck coins before it cracked or before the polished off the leg. Still the same die just a later stage.
Look at any slab from a TPG that attributes a Doubled Die or RPM.. They never use the term Mint Error. https://www.ngccoin.com/news/article/1655/Variety-versus-Mint-Error/
looks like an older style holder.. They made weird labels back then. They sometimes even used Double Die instead of Doubled Die. Now that has been corrected
Ok. Is this better than the original? I added actual coin lettering in the title and my name. Better? Worse? Dumb?
Apparently I am the only one who does not like the title (there always has to be one). I don't like gimmicky titles. The double error implication is OK, but the use of the word die would imply a variety rather than an error. I do like the coin lettering and the pictures are good (but to catch the eye of a non-collector you may want to consider using more dramatic pictures such as off-center, large broad struck, etc..
By "A Sampling of Mishaps, Freaks and Oddities that Escaped the U.S. Mint" do you mean employees also?
Yes someone gave me a grammar lesson on the usage.. But it was removed anyway.. (Little things like that just irk me)
I tend to be a grammar and punctuation nazi as I used to proofread new authors books before going to print.
Oxford commas are sometimes dropped colloquially, but this is for a publication. I would suggest replacing the comma after freaks.