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<p>[QUOTE=&quot;The Eidolon, post: 8055851, member: 102103&quot;]Saltwater corrosion can account for quite a bit of weight loss.</p><p>Copper is much different from silver, but my 4 dalers weighs 1930 grams, and an intact one should be about 3060 g.&nbsp; So it&#039;s lost over 1/3 of its weight somehow.</p><p><br /></p><p>My impression is that cobs, in spite of their irregular shapes, were pretty close to a consistent weight.&nbsp; But all that pitting on the surface makes it quite plausible that a significant amount of metal has been lost.</p><p><br /></p><p>Below:&nbsp; Guatemala 8 reales 1739 cob</p><p>[ATTACH=full]1395761[/ATTACH][/QUOTE]</p><p><br /></p>

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