1970S Reverse stuck through grease?

[cents1st]

I learn better by acquaintance than description. Some learn best by description. For those people that learn by description, books are best. To learn by description then acquaintance would be better yet. I have seen what Mint presses do to objects other than planchets of correct weight. Dies usually survive anything inserted. Planchets generally come in second, third object does not stand a chance. Some planchets--about 1 in 60,000--have uneven surfaces, after being sent through the mill and the cutter, usually being light weight a few grains. When the uneven surfaced planchet is struck some areas are so uneven that there simply is no contact with the dies in that area. That is what is in this 1970 photo, on that coin. I have seen many; they were defaced, weighed for credit, sent back to the planchet manufacture after 10 kilograms were boxed, to be recycled.
I take no offense to your opinion. I wish you had the same perspective.

[Rollem]

Welcome home ROG..!
I guess bus came back

James

[liveandievarieties]

Jupiter is close to the moon today!

The fact is my friend, without any disrespect at all, you cannot simply "imagine" or guess at how the minting process works. There is only one way, this is a black and white subject.

So much of what you say is so highly inaccruate it actually pains me to read it. You can't just go around spouting inaccurate and completely false information as fact. Those of us who have spent years, and for some including myself DECADES in this hobby actually know what we're talking about. I'm a somewhat younger guy, but am nearing my 30th year in numismatics. It's all I've eaten, breathed and pooped for the vast majority of my life. Please understand that--- WHAT THE HECK AM I DOING??? GO AWAY TROLL

[cents1st]

OK, I'll give you the benefit of the doubt and explain it to you, but really, buy a book cents1st!

Under extreme pressure, a thick liquid acts as a solid by blocking the planchet from filling the recesses of the die. The grease is trapped in there, it doesn't squeeze out becase it's trapped against the planchet by the pressure of the strike. That's pertaining to soft grease which produces "greasers".

Another form of this anomaly is when metal dust and miscellaneous tiny debris mixes with the grease and becomes a solid through repeated strikes. This also fills the details of the die and blocks detail from being struck into the planchet. When this "gunk" falls out onto an unstruck planchet, it can be struck into the cent thus creating a "dropped letter" (look it up- I don't invent these terms)

Does that make any sense to you?

I'm okay with everything you said here. I took my position and opinion because there is a raised rim, therefore a type II planchet error. Type I after it is cut, type II after it is rolled (raised rim). The "Greaser" would not have good raised rim? I could be wrong. Should there be dammage to the rim if the grease dammages the field?

[cents1st]

The fact is my friend, without any disrespect at all, you cannot simply "imagine" or guess at how the minting process works. There is only one way, this is a black and white subject.

So much of what you say is so highly inaccruate it actually pains me to read it. You can't just go around spouting inaccurate and completely false information as fact. Those of us who have spent years, and for some including myself DECADES in this hobby actually know what we're talking about. I'm a somewhat younger guy, but am nearing my 30th year in numismatics. It's all I've eaten, breathed and pooped for the vast majority of my life. Please understand that--- WHAT THE HECK AM I DOING??? GO AWAY TROLL

I have collected for 6 decades, worked at the Mint in two decades. I am not using my imagination.

[liveandievarieties]

You are wrong. Buy a book and learn what you're speaking about. Don't imagine and guess and then state your hypothesis as fact.

[liveandievarieties]

I have collected for 6 decades, worked at the Mint in two decades. I am not using my imagination.

Then perhaps you should write a book.

[liveandievarieties]

This is fun, we can go round and round all day but I've got a couple of thousand dollars of die varieties to package up and ship out to several different clients.

[Roller]

Does anyone have a micrometer sensitive enough to detect or debunk the theory that the planchet in the affected area is indeed "shallower" than the field around it? I'm not picking sides and I do belive in the grease theory but if there is a mechanical/positive way to debunk this "uneven blank" theory, has anyone done the test?

[Maineman750]

I'm okay with everything you said here. I took my position and opinion because there is a raised rim, therefore a type II planchet error. Type I after it is cut, type II after it is rolled (raised rim). The "Greaser" would not have good raised rim? I could be wrong. Should there be dammage to the rim if the grease dammages the field?

Why would there be damage to the rim if there were grease on the die ? And where exactly did you work at the mint, I assume not on the floor ?

[Maineman750]

Does anyone have a micrometer sensitive enough to detect or debunk the theory that the planchet in the affected area is indeed "shallower" than the field around it? I'm not picking sides and I do belive in the grease theory but if there is a mechanical/positive way to debunk this "uneven blank" theory, has anyone done the test?

James, the problem there is that grease can also create a depression

[coinman2009]

Wow! Too funny guys! Nice Struck Through Grease Lincoln!

[mustbebob]

I can't believe I am seeing this again, and by the same person. This thread is counterproductive. Cents1st...It might be better if you do not try to show how much of an expert you are, because you are actually failing. If you actually spent that much time on the floor of the mint, you would know proper terminology of certain events, such as Type 1 or Type 2 planchets. They are not cut, they are punched, they are not rolled, they go through an upset mill. They don't return individual defective planchets to the planchet manufacturer after they have been struck. These blanks and planchets were made at the mint during this time frame. They coins are not defaced, the dies are. You would also know that the die does not contact the rim, so nothing should affect it. You are the only one out of thousands and thousands of numismatic people to continue with this absurd theory. Think about that. You are right, and everyone else in the world is wrong? Please don't continue this irresponsible line of thinking. I may be forced to delete or lock this thread. My apologies to the OP, as he made a simple post. Too bad this happened as a result.

[liveandievarieties]

I'm out of thanks, but thank you very much Bob.

[foundinrolls]

The coin is a typical , although very nice example, of a "struck through grease" error. The high pressure of a coin strike causes the lubricant to act as a solid. It is hydraulic theory as it pertains to coins.

Oh, coining presses are lubricated and the lubricant can get between the dies. It is not necessarily, grease, per se. It is not like the gloppy stuff that you lube break parts with on your car, but it definitely acts on a coins surface when it gets between a planchet and a die.

Thanks,
Bill

This is exactly what a struck through grease coin looks like.