My grandfather purchased this in the 50's and I inherited it. I wanted to keep the original box with his hand writing on it and preserve the mint cello so I ultra protected it. It's been away for around 15 years so I took it out tonight to inspect. The toning is about the same as when I put it away. The quarter looked like this when I put it up.
Contrary to some opinions, these coins hold up surprisingly well in the box holders IF the set is stored under consistent temperatures and a low humidity environment. I had to put my 1953 set in a Capital Plastics holder because the cellophane sleeve deteriorated around one of the coins. I have to admit that I enjoy the set more in the Capital Plastic but still prefer the box if it is good shape. The quarter in your set probably had something on it when it was packaged in 1952. Sometimes residue was left from the planchette cleaning procedures.
Half, quarter, dime, and penny showing signs of environmental deterioration. Could be tape, paper, or box. Still very nice coins, congrats.
I'd love to hear more about your "ultra protection", if there's any part of it you'd care to divulge.
Storing silver coins especially makes me a bit nervous, I do have a couple of silver libertads in PR70DCAM my biggest fear is that they will get milk spots or tone in the holder one of the pit falls I guess
First level is a direct holder, generally, I prefer airtites. Then typically ziplock quart freezer bag, a bright red copper cent and a large desiccant pack. Next a gallon size ziplock with another red cent and desiccant pack which I put into a tupperware-type sealed container. Then, I have very heavy, large polybags: https://www.amazon.com/gp/product/B08P416S2F/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1 I put the tupperware container in one of those bags and then it goes into a Husky tub: https://www.homedepot.com/p/Husky-5...ainer-with-Hinged-Lid-in-Red-248918/313861296
You're a man after my own heart Thad Though I will say you added a step or two - definitely "ultra protection"