Your pictures are improving for sure. I see what you are looking at, but I do not think it is a doubled die. If you do plan to look for doubled dies, the best years are: 1969 1970 1972 Those three years have many different doubled dies, and many of them are very obvious. Here is a photo of my only doubled die from 1972, maybe it will help you see what exactly to search for. Don't stop trying and learning the ropes.
Decent pictures, but if you want to be helped it is always good to be specific. Like "Is this a doubled Die? Look at x and y and z or is it just md?" I'm just guessing that is what you're asking, but what I can see appears to be Die Deterioration Doubling from excessive use of the die. The flow lines towards the edge of the coin are the giveaway Oh and the D mint mark appears to be filled, so a small, but common die chip
Today seems to be the day for people just showing coins with no specific direction for us to go. Therefore...I think it's a one cent coin.
These coins are common cents (sorry) old doesn't necessarily mean valuable. It would be good for you to get a copy of The Red Book a.k.a. The Guide Book of US Coins, can pick it up for less than $20 on Feebay or Amazon. That will give you information that will be helpful for you. The prices in it are NOT accurate, but it is a guide. For more accurate pricing I use Numismedia.com, others suggest other sites they like, but I can't think of them off the top of my head. Secondly learn how to grade your coins, when I first started collecting US coins I invested in educating myself and part of that education includes understanding how to grade a coin as value is directly linked to grade, as well as rarity (generally). I bought myself an ANA Grading book from same sources as mentioned above, but you can also go to the PCGS Photograde website to help yourself. Next learn the minting process, so you understand how coins are made and what errors are and are NOT possible at the mint. That will help you identify real errors and pure damage or other non valuable ways coins are altered.
This OP has been given advice, reference links etc. time and time again. He does not want to learn. Read his posting history, self explanatory
To someone born in say the 80's and even new collectors, these coins are 'old', I have regularly seen people posting in other groups these coins from the 50's, 60's and 70's thinking that they are old and therefore valuable. They don't understand that, old(er) doesn't necessarily mean valuable. That was the point of my discourse, aside from 'educate yourself' And the post I was referencing was the 61-D, but yer, you're old lol. I was still in high school in 78. Army 81-87..... @expat sadly that is the case for some people, don't want to learn and like others to do all the work for them