No S Dime Or Penny Proof Sets Quastions Or History

I been thinking about saving up and buying them for my collection in next few years. I love them and think they cool since I used to own an 1990 no s proof set before. I hated selling it and I still regret it. I want to save up and buy them for my collection. I just got an copy of greysheat and been reading it. Its amazing some are cheap and some very expensive. Are there websites I can read about production numbers and the history on them since I love them so much. How many are out in the world . I tried searching the web and never found any history on them and why they came out the mint. When were they found and whats the history on them .
1968 was priced 12000 to 14500. Why so high compared to others.
1970 was priced 1050 to 1150 . You see price compared to 1968
1971 was priced 1350 to 1475 . It was nickel no s proof
1975 was priced at 37000 41000. Its the most expensive and how many have been found on those? This what I read it was show stopper and coin-world I think they wrote an story about it. I never seen the story in coin-world.
1983 was priced at 850 to 975 on that no s dime set. Its the lowest priced coin set out there.
1990. No s penny set was priced 4500 to 6500. They claim on ebay only 3550 were ever made but other people say on ebay onley 200 was ever made on those. Its confusing on those people saying 200 or 3550 made on those. Most the sets I have seen have spots on cent for whatever reason. Why did they spot up in those sets compared to other 1990 proof sets? Was something wrong with the pennys in there?

So where I can find more history and stuff about the famous no s proof sets? I heard the us mint used Philly dies to strike the proof coins when they made mistakes by not using the s coin dies for proof coins is why they were made. Am I correct or did s where off the die like in 1922 on there cents. I don't know the entire history or very much about the no s proof sets. Are there any more years becides greysheet or what I listed here.

I did learn on my 1990 no s penny proof set it could been taken apart and an Philly cent could have been replaced in there to remake it. My family had it years and we never knew it in-till this year my set could have been faked by using an Philly coin or no mint mark penny. I found out when I tryed to sell it. I thought they were tamper proof but I guess not. My cent was dull looking compared to an proof coin. I never knew for sure if came from mint or it was remade. Its history and its gone for good.

So how can I be safe when buying those sets for my collection on switched out remade sets . I need learn about them before I buy sets to keep in my collection. I never heard of companys such as pgcs puting them tamper proof slabs like they do coins to keep them safe. I am concerned on the dime sets people can polish or re-plate them make them proof like coins. Its like anything esle if money there it can faked or remade to make money. Are there companys out there to slab them as intire sets where you don't get the fakes like my grandfather may have bought years ago. It was nightmare selling my set serval monlths ago. I never want to go thru that ever again.

Like I said I want learn and save up to buy them for collection. There is little history on them on net after I tryed looking for them. Those sets are amazing to me and I love them.

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