1973 s proof penny with black dots

Why is the penny have spots

 

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Looks like someone was messing around with silver testing acid and put a few drops on it.

I'll show you how. Give me a minute and I'll do it to a non-collectible penny.

 

Carbon spots. Mostly caused by air pollution from back in the day.

 

Some liquid/chemical reacted with the copper.
Have you ever seen what a few tiny drops of bleach does to colored material?

 

All too well my friend, all too well! In my house anyways.

 

I personally don't use it. I detest the odor!

 

Me too @paddyman98 ! Me too.

 

FWIW - Not 100% sure that is a proof coin. Looks like a standard business strike San Fran cent.

 

Yes furryfrog is correct.
Not a proof. 68-74 s pennies were circulated. Nickels 68,69,70.
There are proofs from those years as well, but the proofs are easily identified.

 

It’s a business strike, not a proof. Some thing has had a negative affect on the copper. It’s a spender.

 

I'm going to retake pictures it 100 percent proof coin

 

Honestly, it just plain doesn’t look like a proof coin.

 

Please post them FULL IMAGE!

 

Sorry, but it 100% isn't.

 

It’s not a proof. The rims look nothing like a proof. Neither does anything else on the coin.

 

A proof will have mirrored surfaces and a slight cameo to the devices.
I am not seeing it. The pictures are too blurry and insufficient.