Hi all, Well, its been a while for me posting on the error pages as I've gotten a bit better at determining MD and dd. With this coin though, I have some serious issues on if its Md or not. The reason why I'm stuck on this coin is because after comparing to regular half dollars, the letters with what I'd normally believe MD is the same size as the letters on other half dollars. In other words, if the sections that may appear to be MD wasn't on the coin, then the lettering would be MUCH thinner and smaller. Let me know what you think, and please explain so I don't have to ask this again should I come across something like this again. Thanks. Chas.
The doubling is flat and shelve like, clear as a bell. The doubling is flat and shelve like, clear as a bell. What are you seeing that would indicate anything but mechanical/machine type doubling?? If what you are saying that if the pushed, scooted, pulled areas were not there the lettering would be a different size then you are right but the very nature or cause of this type doubling has done that, (it could not be anything thinner) if not for the scooted image - it exist because it is a machine doubled coin and thus could be nothing else.
Hopefully I'm understanding the question correctly. Remember that strike doubling, unlike hub doubling or even die deterioration doubling will not add to the devices, but rather take away normal raised width. These devices are incuse in the die itself which produces the raised device on the coins surface. When the die shifts slightly the flat surface of the die contacts the raised devices that were created with the first strike and therefor flattens(shears them off really) them. Does this make sense?
Pretty good explanation but just a bit off jallen, Pretty good explanation but just a bit off jallen, it's not the flat (or raised) portion of the dies that flatten or spread the coins lettering or other devices in machine doubling but the very encuse devices themselfs. It can be no other way. When the die flops or scoots it is engaged at that moment (milli second) with the encuse designe. That is what scoots the image and not the flat portion - if it were the flat portion it would shear or mash instead of scoot. I'm pretty sure about this because if it were the flat or raised portion of the die (doing the scooting) it would not have such contact as we see with machine doubling. In other words, the reason the device is scooted so precisely (and connected) is because it was engaged and not let loose. Hope this helps.
My understanding, and maybe I just worded it poorly, is that it is a shearing that is taking place. When the hammer die is on the way back up, but before it has cleared the raised devices, it twists slightly and shears the device.
Correct but while engaged with the encuse design - it Correct but while engaged with the encuse design - it would have to be still in contact to mimic the design. Otherwise we would end up with mashed, cut and sheared design. Something needs to continue (grip) the the original device or mechanically doubled portion. Another way to put it, "it's not possible to continue the machine doubling if it's not in contact with original encuse portion. Instead of ending up with a flat extention you end up with a mess.
Hi guys I am a know-nothing, total beginner in the coin collecting world, so please go easy on me! If I’m understanding this feed correctly, MD= machine doubling and DD= die doubling? With MD being less than, or not at all valuable in comparison to DD which IS valuable? Do I have that right??
Welcome to Coin Talk I'm kind of new to coins too, but I know some, so I thought I'd share what I've learned. I believe Machine doubling is worthless. Here is a picture I found on a website that explains the difference in MD and DD: Doubled Die coins are valuble, but sometimes not a significant amount. On DD coins the value depends on the visibility of the DD, and the type of coin, and sometimes the buyer. I don't know exactly how new you are to this, but here is a famous Doubled Die coin to look for:1955 1C Doubled Die Obverse, BN (Regular Strike) Lincoln Cent (Wheat Reverse) - PCGS CoinFacts Check this out too:Machine Doubling BTW, this thread is about 11 years old.
