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<p>[QUOTE=&quot;robinjojo, post: 24657970, member: 110226&quot;]The OP coin is a cob minted in Mexico City, around 1714-15.&nbsp; The surfaces show typical erosion (corrosion) from emersion in salt water for hundreds of years.&nbsp; It could be from the 1715 fleet, but without documentation this sheer conjecture on my part.</p><p><br /></p><p>As for authenticity, my guess is that the coin is genuine.&nbsp; The surfaces have the appearance of salt water corrosion, and the coin has been typically over cleaned.&nbsp; The cross side has a somewhat concave shape, consistent with hammer striking.&nbsp; Casts are basically flat on both sides.&nbsp; Further, it is not at all for the strike to be uneven; this is a common feature of cobs and Mexico in particular during the period in which this coin was minted.</p><p><br /></p><p>Weight information regarding the OP coin would be useful, although weight loss would be expected.&nbsp; </p><p><br /></p><p>The OP coin&#039;s photos could be sent to Dan Sedwick for his opinion.&nbsp; Here&#039;s a link:</p><p><br /></p><p><a href="https://www.sedwickcoins.com/contact.htm" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sedwickcoins.com/contact.htm" rel="nofollow">https://www.sedwickcoins.com/contact.htm</a></p><p><br /></p><p>Dan is something of a guru when it comes to Latin American coinage, including cobs in particular.</p><p><br /></p><p>For comparison of the OP coin&#039;s shield, here&#039;s an 8 escudos, 1713, assayer J, for comparison.&nbsp; The shield of this coin is a bit earlier, with subtle differences in the shield design, but it is very similar to that of&nbsp; the OP coin.</p><p><br /></p><p>For 1713, the mint mark is oXM.</p><p><br /></p><p>26.96 grams</p><p><br /></p><p>[ATTACH=full]1571430[/ATTACH][/QUOTE]</p><p><br /></p>

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