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Recently picked up this unofficial farthing token - W.B. Reeves of Birmingham, 1867 dated type (Withers 870). Not the nicest grade but tough to find.

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.

The A-Z 10p's

Me either and I have been on eBay 20 years. You learn something new every day😀.

Well b**ger me! I never realised that it worked for sellers . Thanks Paddy.

A new series started, Kempson Coventry half penny

Another Spence 'Oddfellows' token, bought today at the Malvern flea fair

Spink is still a price guide, not the definitive on what a price is. People still don't get that its the currency issue that was rare and not the proof. Even the RM played on the fact that there was a gold Kew in the recent gold 50p set, obeyers claiming the "rare gold kew" was in the set is pure spin. Its the unwitting that buy into this type of sheeeeeeet.

Dunno about Kew Gardens coins. Have you seen the entry cost to Kew gardens( GBP 16.50). Mt Cootha botanical Gardens here in Brisbane which are like the Kew glasshouse with no roof are free.