My set of coins sent to NCS first came back. I'm very pleased with the results. All the silver coins had haze, one silver showed signs of PVC damage starting and the gold coin had a rubbery substance I couldn't get off. I could see that the contaminate was in some of the devices, so I decided to let an expert do it. These coins were bought online last year at prices that would make some people jealous.
Instead of me posting pics, I'll post a link since they are part of my personal collection.
1977 BVI Silver Jubilee dollar: https://www.ngccoin.com/registry/coins/1989248/
1977 BVI Silver dollar: https://www.ngccoin.com/registry/coins/1989254/
1978 BVI Coronation Jubilee dollar: https://www.ngccoin.com/registry/coins/1989253/
1978 BVI Silver dollar: https://www.ngccoin.com/registry/coins/1989255/
NGC had to fix their database as the 1978 BVI Coronation coin wasn't recognized in the BVI dollar category, but would be happy to put the regular 1978 dollar into it even though it was labeled for the coronation coin. 1977 BVI Silver dollar is a PF70UC (Woo Hoo!!) and the rest were PF69UC, so I'm pleased overall of the results.
1969 Guinea JFK & RFK 200 francs: https://www.ngccoin.com/registry/coins/1989260/
1994 Niue JFK $25 Gold (1.2g): https://www.ngccoin.com/registry/coins/1989262/
Guinea coin looks better as both sides were PVC damage. Looks like it was light enough that it still gave me a PF68UC. Still see some dark spots on the faces, but much better as they were dark. I have the 1970 sister coin at NGC being rated and that coin looked so much better.
Niue coin I'm very happy with. I would like NGC to open a separate $25 gold for the smaller ones (1.2g) as their current one is 1/4oz, which is much bigger than a 1.2g coin. I may have to get a few of the 1.2g coins to show a need for a separate category.
I also got an email today that 3 of the coins I sent to NGC in the other batch needed some NCS TLC work. Of course I said go ahead, just hope it won't take a month longer. 2 of the 3 happen to be BVI cent coins that go along with the 1977 Silver Jubilee dollar coin as it was part of a proof set. Same with the Coronation proof set went in on that batch. I didn't think those coins look looked bad, I guess I'll see.
I think when I send the next batch to NCS, I'll take before pictures because the difference is great.