1970 s large date I believe? Which looks to have doubling on the "970" and "S" mint mark. If so what is the coin worth? Are they pretty common? also does anyone know approximately how much it would cost to send it in to get professionally checked? Thanks in advance!
the "doubled" part to me looks like it is flat so that means that it is machine doubled aka shelf doubling which carries no extra value in the coin market some people may pay a little extra for it if they want it bad enough. Im not an expert but know some things about error coins ,maybe someone else will chime in.
The proper term is Doubled Die not Double - quote "Note that the proper terminology for this occurrence includes the letter 'd' at the end of the first word, hence "doubled die". The term "double die" without the first word ending in 'd' is not proper numismatic terminology" closed quote I want to share this webpage with you - https://en.wikipedia.org/wiki/Doubled_die
Hint: Since the mintmark is punched into the die separately from the rest of the devices, when you see the (here) date & MM 'doubled' the same amount, then it must be machine/strike doubling.
Frank that's one of the best hints I've ever heard regarding machine doubling VS. a true doubled die. I know this doesn't work for more modern stuff, but its a great nugget of knowledge.
The other thing is even though the doubling is radical, and attractive, you can clearly see that the doubled part is at a lower elevation, with a flat shelflike surface (not rounded or curved like the stronger lettering on top).
I would give a best answer if all doubled mint marks were machine doubled. I agree it is a good indication of machine doubling, but not all doubled mint marks are machine doubled.
He didn't say "all doubled mintmarks"... The latter part of the above quote, with the word "and" in particular, is the key here. Other than arguably word, he is correct; it was a fine hint and one worthy of a "best answer" (in my most humble opinion).
You and I may understand that, but to a novice, it could very well lead to confusion. http://koinpro.tripod.com/VarietiesUS/1970S1cRPM01ArW.jpg One of the Top 100 RPMs known to exist.
If you look at this link http://www.pcgscoinfacts.com/Coin/Detail/37997 you can clearly see what a DDO for this date looks like. As to your, question there is no value for machine doubling.
In no way am I disputing your conclusion on the OP's coin, but it's only fair to point out that there are a number of DDOs for this date/mint, although the one you linked is the most significant and well-known. http://doubleddie.com/452412.html
It has already led to me becoming confused... I wasn't aware the linked RPM was also a doubled die, nor have I, thus far, been able to find any independent mention of it being one.
What's confusing about a RPM coin with machine doubling? Just saying there are exceptions to the stated rule.
First post! I see doubling near the date and MM but nowhere else. So it must be machine doubling, which is considered damage because it happens after the coin is struck. Some people might pay a little extra because of the oddity, but don't expect to *usually* get any more than market value for a machine-doubled coin.
What's confusing about it, Hommer, is that we seem to be talking about, at least two some extent, two different things. You are, of course, right in that a genuine RPM can certainly display strike doubling on the date, but Treashunt was also correct in saying that a coin (from this era) that displays "doubling" on both the date and mintmark, with similar (for lack of a better term) "spreads" in the same direction are almost always strike doubling.
