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I think that is due to copper coins being more reactive than silver and is more susceptible to the effect of moisture and gases in the atmosphere. Hence copper is more likely to change even after slabbing.

I knew there was a 10 year "guarantee" but I'd no idea it only applied to the metals referred to.

I'm going Pound, 50:1, Liz Truss 1000:1 Russia invading 100:1

I would like to learn, in case if i discover the Scotch Tape proof coin earlier (due to capsule unable to screw) n have picture proof n the auction catalogue didn't mention it, is it possible to refuse acceptance of the auction items?

Wonder what the long delay was all about. OK, so you live overseas, but that shouldn't affect posting dates. With regard to the capsule being wrapped in Scotch Tape, I find that inexplicable. I've had soft fabric round a coin, and that soft fabric wrapped in tape. But not the envelope or slab itself. As you rightly point out, you'd know immediately if the outer package had been tampered with, and the fact it was undamaged suggests the wrapping took place at LCA.

Something like that? Possibly, maybe.

Actually, i don't know there is a 10-year benchmark for bronze/copper coins. Me too, once you notice any impecfection, you will always look at it😅.

I think most of us do from time to time. The problem is that a blemish might be insignificant, but you will keep looking at it after it has been spotted.l keep mine in quadrums and so I don't need to worry about new scratches etc. But l do ask questions like if lustre has subdued on one side over time or is a carbon spot or other type of spot becoming more noticeable.

Well, sort of, but it was my fault I guess. I bought a truly fantastic 1926ME Penny from a Spink SNC in the year 2000. Coin listed as GEF, but in fact on delivery noted it to have booming red/orange lustre. I was a bit nervous about maintaining the surfaces in the humidity of the Washington DC area and so about 5-6 years later slabbed it - it still looked superb but after about 10 more years the lustre had given away to Red Brown surfaces. Still the nicest I have seen but my goodness how it hurt....BTW the coin is the PCGS "plate" coin for the date if you look at their "Pop Reports" (it graded MS65RB).