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The Standard Guide to Grading British Coins by Derek F Allen is available direct from Coin Publications, for £11.95:
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Recent Posts
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I have put pennies into acid baths on numerous occasions (for serious purposes at work and not fooling about.) The edge would invariably thin out first. Even for the sake of argument that someone were to use a wax to protect the edge, an acid would still "smooth out" the surface marks. I can't see how the design has nearly disappeared with so many surface marks left. Then there is the flattened date. Acid won't do that. -
Having owned couple of acid bathed coins I agree with Rob. Acid doesn't shear off the main design leaving the original thickness - it attacks on all axies, leaving a much thinner coin with the elements of all the original design still clear enough to see, including the legend. -
MS is MS, MS 60 is an un-circulated coin. Higher grades are more subjective with MS61 and higher attention is paid to strike, bag knocks, luster. toning etc. Wear and poor strike being very difficult to distinguish when it is slight. Also attention should be paid to the condition of the milling of the coin edge The whole point of TPG is consistency for valuation and comparing coins. The subject coin from the photo shows slight wear on the higher points and more correctly graded AU 55 - 58 or EF IMO. Personally I prefer the Sheldon as it gets rid of the abt. nearly + etc that are much more subjective. However it must be applied accurately to be of use. Having said that the book The Standard Guide to Grading British Coins is a good guide -
Reverse 1st Diagnostic : Pronounced vertical die crack originating from top of Britannia's head, undulating/squiggling at 2mm distance from the inner rim border, terminating precisely at the baseline of the first N. Reverse 2nd Diagnostic : Associated branch crack extending leftward into the olive branch cluster, manifesting as a faux leafless sprig adjacent to the standard 10-leaf configuration. ( Severely lapped reverse die resulting in a missing leaf / ghost stem variety.) Reverse 3rd Diagnostic : Equally spaced masts (Type C / Large Letters reverse hub diagnostics). -
I see your point. The designs of modern coinage, including pre-decimal QE2 as here, are low relief to prolong the die life, almost 2-D with negligible depth, and thus it might not need much acid dunking to erode any shallow raised detail, if it were treated so. As the adjacent field would also be dissolving that may produce the expanded effect as shown, almost like a ghost image, but that's just thinking of a theory and probably doesn't make sense. The marks aren't acid marks either, they're loads of small cuts, perhaps kept in a tin with other coins for many years.
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