I had posted this on a different site, but I think that it can be used here, since the same questions with the same answers show up repeatedly: Just so some of us don't have to keep ID'ing the same type "error" and sometimes listing references, here are some references to keep in your pocket. Wexler's guides/info is copyrighted, so be prudent on how it's used .. but it's available on-line. Just don't use this as part of your own writings: http://doubleddie.com/58222.html http://doubleddie.com/144822.html http://doubleddie.com/144843.html http://doubleddie.com/58327.html http://doubleddie.com/144801.html
The topic itself is much more important than syntax. Different authors have different titles for the same subject. In actuality, there are some doubled coins (I'm thinking Canadian large cents) that had the working die struck by 2 or more different hubs .. and that makes it a "double die". It's not worth the effort to differentiate between the 2.
I was hoping Bill, you were going to do a write up on " Coins & Canada " web site . http://coinsandcanada.com/
No that makes it a doubled die. The die is doubled, and the coin is struck from a doubled die. Double die literally means two dies and every coin is struck from at least two dies
Every time I google "double die" that term never comes up. It always reverts to "doubled die". So yes, it does make a difference to use correct terminology.