You're the man, Dave! Whilst I'll never be collecting in this field, or will ever check my change (even though I do occasionally look at my 20p's), I totally respect the methodology and dedication!Great stats...and just when Declan thought he was free! Coinery, I've no intention of continuing this kind of study again - it was extremely tedious - so I'm not likely to be reporting on the twopence etc. However, I am overawed by those earlier numismatists in the dying days of £SD, who studied all the pre-decimal material before it disappeared. One individual examined around 250,000 specimens. The name V R Court springs to mind, but there were many others, plus Ron Stafford who examined much post decimal 'silver'. Dave G Ron Stafford's dedication to duty on the humble 10p defies ... description, belief, everything! The nearest thing I did was being able to tell the 'finish' apart - that rather attractive satin finish of 1968-69, to the plug-ugly 'mirrors' of the mid-70s.