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<p>[QUOTE="Heliodromus, post: 7709876, member: 120820"]FYI, RIC failed to note that this type was actually struck at two different weight standards, first at a nominal weight of 1/40lb (8.22g), then a later issue at 1/48lb (6.85g). However due to extremely poor weight control the only way to tell the two issues apart is actually by size, not weight. The size that matters is the die size (i.e. the size the coins were meant to be), not the flan size which varies a lot.</p><p><br /></p><p>The critical measurement is the pearl ring diameter (PRD), the diameter from center-to-center of the dotted border, with the early heavier issue measuring at approx 24.5mm and the later lighter one at 23mm. The numismatist Pierre Bastien ("Some Comments on the Coinage of the London Mint") gives measurements of 24mm and 23mm.</p><p><br /></p><p>I loaded the picture of your coin into a photo editor to measure it, and it seems the PRD is 24.5mm (based on the max diameter being 29mm), which means it's from the earlier 1/40lb issue.[/QUOTE]</p><p><br /></p>
[QUOTE="Heliodromus, post: 7709876, member: 120820"]FYI, RIC failed to note that this type was actually struck at two different weight standards, first at a nominal weight of 1/40lb (8.22g), then a later issue at 1/48lb (6.85g). However due to extremely poor weight control the only way to tell the two issues apart is actually by size, not weight. The size that matters is the die size (i.e. the size the coins were meant to be), not the flan size which varies a lot. The critical measurement is the pearl ring diameter (PRD), the diameter from center-to-center of the dotted border, with the early heavier issue measuring at approx 24.5mm and the later lighter one at 23mm. The numismatist Pierre Bastien ("Some Comments on the Coinage of the London Mint") gives measurements of 24mm and 23mm. I loaded the picture of your coin into a photo editor to measure it, and it seems the PRD is 24.5mm (based on the max diameter being 29mm), which means it's from the earlier 1/40lb issue.[/QUOTE]
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