Last night I found a 2014 Jefferson with a small senicircle in ctr doorway of Monticello. Pretty cool little error that seems to have different opinions as to its origin. I saw a post with an overlay that "Could" line up. Does anyone have more new info on these, their population/ rarity, possible value, etc...Seems a 2016 was found also, so 2014, 15 and now 2016 all share similar die varieties... Any info would be just swell there fellas!!!! lol......Merry New Year!!!!
One seems to be much bigger than the other. Since these coins were stamped/pressed, how and why would a lathe mark be on them? I've never seen these marks before and they've got my curiosity up.
Here is some information http://www.errorvariety.com/Lathe-lines/ And an old CoinTalk thread https://www.cointalk.com/threads/what-lathe-lines-look-like-on-a-die.200381/
Hey guys, thanks for your input..Ive read about all I can find online about these and the whole "lathe line" angle seems to be the most popular. There are a few other opinions but no one seems to have a rock solid answer. 2014, 15, and i saw a 16 nickel as well as a few penny dies are the only identified examples Ive seen so far...Is definately somethin different to look for though!!!! Happy new year!!!
Its also a little funny that the overwhelming majority of errors on the new style Jeffersons all revolve around that center doorway...inuding these circles...just a thought....
My speculation: When it comes to lathe marks, the error can be anywhere in the field of the coin (and typically it is rather than a single mark like we are seeing here) and generally concentric based on the images at the site Paddy provided. I suspect that if there is a deeper 'groove' left by the lathe and not adequately removed, then the conical rod that's made into the working dies will have that minor defect (note: during the turning process, I suspect that they may make a few passes to create the conical section and depending on speed/tool condition, the finish will be different). During the squeeze (between master/conical rod), I suspect minor grooves created during the turning process (or not adequately removed during finishing) are obviated. But the deeper ones are not and make it into the design of the working dies. I think this is what we are seeing here. Dull/chipped tools may have been the culprit. As for the mark being centered, it may be associated with the way they press the master die into the working die. I know that there is some play that may cause a mark like ours to drift a bit NSEW and could be exacerbated by the angle of the master as it is pressed into the conical rod. I know that this movement is what affects the working dies in the creation of the minor DDOs/DDRs we are seeing. It would be interesting to hear what some of the experts think is happening. I must agree with others that I'm necessarily satisfied with the answers I've been given or read including my own theory as to how it might have happened.