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All the talk lately about decimal coins I bought two a few years ago as both were different and came with a Royal Mint letter. A 1999 Twenty pence struck on a one pence blank. Royal mint say...A copper -plated steel blank intended for a 1p piece has become mixed in with 20p blanks and has been struck by 20p dies in the normal way. A 2002 SILVER two pence. Royal mint say.....As with the 10p piece of 2001, this coin was struck on a blank intended for an overseas coin. Would think with the letter aswell quite unusual. £95 for both including Special delivery. Pete.

heres a nice IOM coin ()

NICE COPPER 1821 TONED FOR THOOSE WHO PREFER A COIN WITH NO LUSTRE

They sure are pretty. They make my bits of bronze look like the poor relation.

Yup, all just a bit sharper, isn't it?

No offence meant MBE, although I hadn't quite grasped your intent. I used to deal extensively in African coinage and looking back on the records, it seems I've never handled one of these in any condition. One way to grade it is to find a good example of the Brazil 40 reis of 1753 which has the same design or there is an uncirculated 1781 40 reis in the Mountain Groan Collection, which should be googleable (is that a word?)

They sell circulating pieces for more than face value all of the time, just look at the commemorative 50p & £2 coins. They are not going to sell a specific error as an error coin, but does the frequency of them having errors / unique varieties keep people buying the next grossly overpriced proof set just in case they bag themselves a variety? From the latest RM Bulletin. "The 2016 United Kingdom Silver Proof Coin Set... This is the only way to own the £1 bearing Matthew Dent's shield of the Royal Arms design, dated 2016 and struck in precious metal... Price £595.00" So they do have an eye for varieties, and it will cost you six hundred quid if you want a silver £1. Thread envy is a terrible thing Nordle

A nice thread, surprised it didn't get more responses! The one that got me was an overweight double brockage, a reverse and an obverse brockage stuck together. I think I paid about 100 pound for it in excitement when I first started collecting errors. I didn't realise at the time that it was 2 coins, so when I did realise and sold it on, I probably got about half of what I paid

MBE, the other forum you have asked on this subject have given you answers based on their experience of world coins, and more specifically coins of this type. Predecimal is the go to site for GB coinage. Respect other sites for their unique knowledge

Yes, although, to me, it does look rather more like chemical corrosion, as opposed to water damage. Certainly not blunt trauma.

The 1967 off-metals are probably the mint workers having a bit of fun as this coincided with the closure of the mint at Tower Hill and its relocation to Llantrisant. There are quite a few of them about. The 1868 cupro-nickel proofs were intentional as all denominations otherwise struck in bronze are known and it coincided with the introduction of cupro-nickel coins for Jamaica. Copper and bronze don't perform well in humid tropical conditions, so they switched to cupro-nickel for this reason. The same applied to a number of British possessions with similar climates. For example, here is a third farthing struck in cupro-nickel from the same period.

I'm not sure TBH, I would go with some sort of corrosion though as it's over the whole coin.