Ok was bored and looking through some recent purchases i added to collection. I happend to take a good look at my new 1976 silver 3 peice proof set. Looking at the half I see some very telling doubling so i look up the coin and sure enough there is a 76 DDO half and it is usualy DDR as well, on checking well i think i got one Opinions Please I haveing a good week for DDOs first the 66 now this one
Ok ok now i got 2 coins i seriously want to get slabbed guess i just gotta stop being a penny pinching miser and pony up the $129 for the gold PCGS membership (4 vouchers for grading included) since even through anacs would cost me almost that much to do 2 error coins. Damn i hate admiting i'm wrong, sorry guys
I don’t see any doubling in your photos...maybe some MDD. You said you looked it up and you have one...where did you look it up? I don’t see any listing for a 76S DDO silver proof in the CONECA listings? http://www.varietyvista.com/Variety Master Listings/kennedy doubled dies 1971-1994.htm#_1976-S Larry Nienaber
I wouldn't get ready to retire just yet. There is very slight, hardly noticeable, doubling that is not from a double die, but mechanical doubling.
working on lighting yes I'm pretty sure most of the doubling on the coin im seeing is MD. I am again attempting to get a 3rd light so maybe i can finaly get rid of the shadows on the coin a get you a real good pic. There is truly an art to getting good coin pics
I have noticed that quite a few people on this site, actually most every one, use the abbreviation MD for Machine Doubling and Mechanical Doubling, like in this thread. I was brought up to use the abbreviation MD for Master Die, and MDD for Machine Damaged Doubling. I wonder which it should be MD, MDD, or maybe SD for Strike Doubling. Larry Nienaber
It should be MD for mechanical doubling as that is what it truly is. Considering what causes mechanical doubling, also called machine and strike doubling, is a mechanical issue during the striking of the coin. A loose collar or die, the coin shifting during striking, the die being jarred out of position from vibration of the press, or improper machine maintenance, is mechanical and causes MD.
Thanks for the lesson...but what then would be an abbreviation for Master Die? The reason I brought this up is because I am not sure if he is thinking the doubling on his half dollar is Mechanical Doubling or Master Die Doubling, when he uses MD. Larry Nienaber
A Master Die is a metal punch used to produce the working hubs, which in turn are used to produce the working dies. So the MD usually refers to mechanical doubling. Master die doubling is entirely different. Here's a good reference on Master Die Doubling: http://doubleddie.com/203801.html
You sure are a good source for information...but you didn't answer my question. What would be a good abbreviation for Master Die? Who says, besides you, that "MD usually refers to mechanical doubling"...your not speaking for the die variety collectors I know. Larry Nienaber
I've always known it to be referred to as Master Die, no abbreviation. Anyone who is discussing whether a coin has MD(mechanical doubling) or DD(double die) I wouldn't know any of the collectors you know as I'm in N.Y., and you're in Arizona.
