Another Good Extreme MD Example

Yes that is very extreme MD! A month ago I would have been sure that that was DD.
I may even have posted on ebay as a DDO with arrows and everything...

Nice example of MD vs of course what everyone wants is really the real doubled die https://www.doubleddie.com/314201.html

Sometimes these 'worthless' doubling still have demand for them and sell often. Havent checked but the 1969-s might fit that bill also since the real DD is expensive. Doubled dies have doubling on the die itself that will strike the coin image, that is why its called a "doubled die". In the years 1953-1957, the mint had a habit of keeping the Lincoln Cent dies in use too long trying to increase the life of the Lincoln Cent dies and when the dies wore, it can create what is called " Die Deterioration Doubling" like what you see on the 1955 poor man's doubled die and those other dates. This is why certain dates of errors like the 1955 poor mans doubled die have also become popular even when it shouldnt be, possibly due to only having something like 15,000 of the true popular 1955 doubled die and its very high cost to obtain, helping to fill albums that have a slot for the 1955 doubled die instead of the dreaded hole.

In general MD isn't considered to have value and typically not be sold by dealers, however some people do like and buy them for several reasons, just important to accurately list similar to the description as below so that people arent being ripped off by thinking its the actual doubled die.

1969-S Lincoln Memorial cent with STRONG Machine Doubling (MD) on the date and mint mark (or whatever area is doubled). Note this is not a doubled die, but an excellent example of Strike Doubling.

That is indeed an extreme example.

I still struggle to distinguish between Machine Doubling and Die Deterioration Doubling.

Take a look at the Variety Vista site and note after the early 1970's dimes there are rarely found one after that point.
http://www.varietyvista.com/07%20Ro...Listings.htm
So I pass them by. Learn what to look for the on the DDR's, post 1999 so you can train you eyes to find the real doubled dies. (They are not where you are looking)
http://www.varietyvista.com/07%20Ro...Listings.htm
Look at each listing to see what your eyes should be looking for and save your eyes from looking for Machine Doubling. I always figured it there is a DDR on one year, why can it not happen on the same areas on the single squeeze dies. They doubled dies are on the centers of the design on the dies.
(Not like the ones in the past that were on the outside edges of the devices. So you have to train your eyes as to what to look for now and stop guessing?) You will be surprised at these listings and then you will figure out why you were looking in the wrong areas for a long time. (Again post 1999 dime reverses. Obverses are pretty much duds!)