2006 Nevada Proof, Hub Or Mechanical Doubling?

Hi Margaret

My opinion is that it is Mechanical Doubling ,, due to it being present on both the mint mark and motto as well as other lettering.


Rick

First thing: "hub doubling" is synonomous with "doubled die" - these are the valuable ones that carry premium value. All mechanical forms of doubling as they occur on the coining press are known as " Machine Doubling", " Strike Doubling", or " Mechanical Doubling". All are essentially the same thing, and all are worthless.

Second: The rule about doubling on the mintmark AND other features being definitely Machine Doubling relates ONLY to coins minted prior to 1990 when mintmarks were punched into the dies by hand. All Statehood Quarter hubs had the mintmarks machined into them as a part of the design, so if a case of hub doubling were to surface, the mintmark would be doubled with any other design features that were doubled in the same vicinity.

Third: The coin shown in the images is Machine Doubling. The doubling is flattened, it takes up part of the normal thickness of the letters, and does not have any sort of notching at the corners. It matches all the rules for Machine Doubling.