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Mike is probably spot on here, (no pun intended) humidity and acids are the cause. A chap in China made a study of the effects of sweat causing pitting corrosion on brass coins using synthetic sweat. Here's a snippet which might be of interest. "Corrosion behavior of brass coinage was investigated in synthetic sweat solution by electrochemical measurement and surface analysis methods including scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX). It is indicated that chloride ions in sweat solution accelerate the anodic active dissolution of brass, which is the main reason for pitting corrosion and dezincification corrosion. Meanwhile, lactic acid and ammonia water also promote the anode reaction. The corrosion products on the surface are mainly composed of basic copper chloride, cuprous oxide, the complex consisting of urea in association with copper, and few lactate ions. The kinetics of pitting corrosion development obeys the following equation of J0=0.3735(t+185.93)−1/2, and the process is controlled by the dissolution of salt deposited on pit surface." So, it would seem that if your coin is dehydrated then, the brake is on for pitting. 'Handle with gloves' and keep them in a very dry environment would seem the way to go here.

Can't think of a more endearing theme for a coin collection. Not for the savvy Investor.

Or if the "make offer" facility was available.

I know there are many threads already about the 1983 mule but i thought this one needed a new post. I have kept tabs on them for many years and read the rumours on here that they may have been in the annual coin set but have never seen evidence of one until now. There is a set up on eBay now and have a comprehensive reply from the seller. https://www.ebay.co.uk/itm/RARE-1983-2-New-Pence-in-Unrecorded-Royal-Mint-Brilliant-Uncirculated-Coin-Set/233308601941?hash=item365246be55:g:SdIAAOSwYXVc1C4A

I removed the capabilities for a Guest to make a report, I think he wasn't going to stop.. If someone wants to report something, I'm sure they wouldn't mind providing a bit of info!

I guess he has picked up on this as he's reporting nearly every single post in this thread pertaining to him.. I've disabled the 'Reporting' feature for Guest accounts, so we all stop receiving spam.

She is the gift which keeps on giving.