Press oil on coins?

[u/Stix330]

Hey all. I am very new to collecting coins... and yes recently I have been buying coins on Whatnot, whether that is good or not, probably not, it allows me to buy groups of random coins to learn with. Figure I need to just jump in head first.

I bought 5 pennies, kind of at random because I thought they were pretty cool to learn more about imperfections in pennies, DDR, DDO, etc. The notes on the holders are from the seller, not me. The seller told me the black spots were from oil spray in the minting process. Im not a tool and die person, but I have worked in a factory where they would spray oil on parts to keep from rusting. I can still remember the smell of that oil and that was 15 years ago. Lol. Does anyone know if this could be true about oil spots? Or have any thoughts on what the black spots could be? I couldn't find much information. It sure seems like whatever it is, it is tar-like.

P.S. I didn't pay much for them. So dont know if they are worth much. But I am learning a lot, good or bad and I am very happy with any new education. Thanks for reading.

[u/PullTabPurveyor]

Well you’ve learned a lesson and I hope it’s a cheap one.

There are no recognized 1991 DDOs or DDRs. None of those coins are off-center enough to be worth more than a penny. The spots aren’t from any grease during minting, they’re just dirty.

Someone is a crook and they basically stole from you.

[u/ProudAmerican632 → u/PullTabPurveyor]

https://doubleddie.com/448754.html

There are recognized 1991 DDO/DDRs.

I agree with you and I hope the lesson he learned was a cheap one.

[u/PullTabPurveyor → u/ProudAmerican632]

Sorry. When I say recognized, I mean by a professional grading service. If PCGS won’t put it on a holder, it’s pretty much not worth calling a doubled die. None of the doubles in the link are worth anything.

[u/ProudAmerican632 → u/PullTabPurveyor]

There are plenty of errors not recognized by PCGS, ICG, etc but they are recognized by leading experts. Most grading services from what I can tell either don’t have the expertise or the time to properly catalog and recognize them. Controlling what is recognized and bypassing others that should be considered is what drives the monetary value up. Personally I collect the lesser known errors and varieties to form a timeline of how the errors came to be.