2007 D Quarter Error Or PMD-Covered With Tiny Cracks

Slabbing and vacuum, if you can.

Sending?!! You have to specify very well what you want and arguments. If not they will go by what already agreed in the past, Good Luck. You need some recognized specialist to say.

Try with Mike or Fred or KEN, just a few. Or Steven in Florida, maybe. At ANACS are some but they work others things. PCGS and NG will not go deep. VSS maybe, not sure.

You discuss here about forensic of the coin, not about daily minor DD or such. You discuss about production quality of the materials and manipulation. Hope help and welcome to the to words of collecting.

It is not more or less knowledge. It is in fact that the TPG do business not more then this. This do not mean they do not can do forensic or really things. They can do, but they work certifying a coin from 30 sec to max 2 min. Your coin need tests, need different point of view of the traces, and more. For a coin like your in my Lab we spend around 6 to 7 hours with high tech equipment. They do not do this. Try with Mike Diamond (is here on the forum) he could help. Or VSS company (they do not grad but certify varieties and production errors).

This theorem make sense for me. The human body waste are very acidic full with the both kind of acid: strong and mild, and also very corrosive acidic bases. Make sense, maybe one day free, to test this theorem in the Lab. for the moment we test more the reactions of the Silver and Gold with the human body.

Very interesting. I have learned something new on this one. Requires more research on my behalf.