1970 S Large Date 1 Cent Doubled Die?

Looks like MD to me. Did you check all three reference sites we all need to do? Also, stop going to that dealer.
John1

Agree, looks like Machine Doubling. Nice example.

Agree, this is just MD.

Take a look at the 1970-S Page on Variety Vista to see what a DDO could look like on that year/mints design:
http://www.varietyvista.com/01b%20L...201970-S.htm
Note that that year has some unusual looking doubled dies. (in areas not seen on other years) But as mentioned, your coin is not a DDO. It is just Machine Doubling. How to tell what a DDO looks like:
Note the DDO-001:
http://www.varietyvista.com/01b%20L...0SDDO001.htm
Note the spread is on the center of the devices. Note on your coin the affected areas you are looking at are on the outside edges of the devices, on all the devices on that area, they are all affected on that one side of the devices. Also the affected area is reduced/flattened by removing the contour of the devices that were there before the post strike damage happened. Thus the devices are reduced in size. Now note the devices on the DDO-001? They are larger, because of the spread of the devices. Not reduced from the machine damage caused post strike. A doubled die coin is from a coin that has hub doubling enlarging the size of the devices. The devices are enlarged. On some of the devices on this year, there is an addition to the devices.
http://www.varietyvista.com/01b%20L...0SDDO002.htm
Note the description box? That will tell you the affected areas of the doubled die. Note that not all images are showing the DDO, but the ones in the description is showing the hub doubling. So always look at the description box to see what really is the doubled die. The difference? The other images that are not affected will be normal devices. But on these images some die markers maybe present. So they are there for that purpose. Die markers are like fingerprints to identify die state of the die that stuck your coin. So looking at the outside edges of devices will show you Machine Doubling or die wear towards the direction of the closest rim. So look for the spread of the devices on the centers of the devices, not on the outside edges of the devices. Hope this helps. Always ask for more information. We are here to help you train your eyes as what to look for during searches of coins. The better you train your eye, the sooner you will spot what you are looking for in your searches. Machine Doubling is very common to find on coinage. A doubled die is more of a rare event.
Note on this image, how much larger the devices are on the DDO-001:

Note on this side by side, the Machine Doubling reduces the size even more than normal example?

Thus comparing images with the same width, cropped on the same areas will help you see the differences from a normal device size, a doubled die and Machine Doubling. Making these helps train your eyes to know the differences.
Even lighting can affect images:

The spread on coins need to be in the same direction/same amount of spread in order to be from a certain die. This all comes with time in knowing/seeing the differences of hub spread. It takes time. We didn't start school and graduate from school on the first day of attending school. So don't give up. It just take time to train the eyes. Hope this helps.

Wise.




I personally would suggest redefining the term "reputable" when applied to this "'expert.'" He was suggesting a 150.00-200.000 mistake at your expense.

Not being mean...just truthful

Good call to stay away from that coin 'expert'. This is obviously Machine Doubling and not worth more than face value.

Classic Machine Doubling. Keep searching!

P.S. - your dealer is just trying to have you use their 3rd party grading service, which puts money in their pocket. You did well coining here!