1970 Semi-silver Lincoln cent.

Sorry, yours isn't a proof. Proof for 1970 were minted in San Franscisco. It would have to be a 1970-S.

 

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True. I check it my self also. Any way, at least now I know that; "planchets" were made for "Proof Lincoln's" with the same SILVER COLOR SPOTS REACTION for San Francisco Mint. The company making those planchets is an Xtra place, and may be by error, were sent some planchets like that to Pennsylvania. My penny look the same like (robec) post. The only difference is... I'm not so good in taking pictures.

 

Wow robec!

 

It's called toning. It's not an error.

 

Besides, you could swallow one and get aluminum poisoning. Or poke your eye out somehow. All dangerous coins should be illegal.

 

I would think that users of Maalox, Mylanta, Gaviscon , Gelusil, etc. would be in treatment everywhere . All contain aluminum hydroxide.

 

Keep in mind, that aluminum is a third of what copper weighs. And even in hand, you can feel the weight differences. I'm not sure if that was mentioned already because I just read the OP, but there is a little bit of facts for ya.

 

True... It's TONING. The error is that: This planchet was made for be a Proof coin. No to be sent into circulation.

 

Highly doubt it.

 

That makes two of us.

 

Your doubts have a good reason. My pictures are no clear enough to convince the eyes of some one. The only thing it's clear for me is that; "IF" plated is involved. This was made, under, regular Gov. Specifications.

 

Again, it wasn't. If I were you, I would move on to something else.

 

Highly unlikely. At that time planchets tended to be made at the mints where they were struck so there would be no reason for a planchet made in San Francisco to wind up in Philadelphia.

Some planchets may have come from an outside contractor, but the planchets for a proof and a business strike were the same until the planchets for the proofs were highly burnished after annealing, and that was done at the San Francisco Mint. Once again how would a planchet, after burnishing, get from the S mint to Philadelphia?

Planchets that are determined to be defective for proofs, are sometimes sent to Denver, but not to Philadelphia.

 

You can add one more error "NO S"

 

No you can't! Cents weren't struck in San Fransisco in 1965. C'mon Carlos.

 

Actually San Francisco struck over 220 million cents in 1965, but since by law they weren't supposed to use mintmarks that year (or the next four years, they ended it two years early) this 1965 cent is not an error. (and frankly how do you know this coin was struck in San Francisco and not Denver or Philadelphia?)

 

Thanks for the facts, Conder. I just knew there weren't any with the S mint mark.

 

If this 1970 penny (silver toning). would have an "S". There's absolutely NO ERROR. Because can be a Proof cent putted in circulation. But, if this one was an "(OLD)" planchet intended for make proof cent. YES, THERE'S AN ERROR. Just yesterday I checked some of the proof cents I have in home. And that one (1970 cent) is the same silver toning you see on some proof of different years.

 

It's not a proof planchet.

 

Seem like the same Barnish is normally used in proof Lincoln planchets. I know my pictures are no clear enough, but it's the same burnish. That was the reason in the beginning I did said it's similar to Dicronite Film Lubricant.