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<p>[QUOTE=&quot;lordmarcovan, post: 2956898, member: 10461&quot;]I&#039;m not sure what you mean by a &quot;Provenance Certificate&quot;.&nbsp; Provenance is a record of past ownership, and if you have bills of sale or other documentation of your grandfather&#039;s purchase of them, <i>that&#039;s</i> your provenance.&nbsp; You indicated that this provenance dates back to between the 1950s and 1990s, which tells me you must have some kind of documentation.</p><p><br /></p><p>Provenance and authentication are two different things.</p><p><br /></p><p>If you want professional <i>authentication</i>, then one of the big names for that is <a href="http://www.davidrsear.com/certification.html" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.davidrsear.com/certification.html" rel="nofollow">David Sear</a>, through his Ancient Coin Certification Service (ACCS).&nbsp; This is expensive, however.&nbsp; I have never used Mr. Sear&#039;s service but can attest that he has a solid reputation in the field.</p><p><br /></p><p>An alternate route would be to submit them to Numismatic Guaranty Corporation (<a href="https://www.ngccoin.com/specialty-services/ancient-coins/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ngccoin.com/specialty-services/ancient-coins/" rel="nofollow">NGC Ancients</a>) for encapsulation and grading in plastic &quot;slabs&quot;, though this is also expensive, and NGC does not actually offer an ironclad guarantee of total authenticity on ancients.&nbsp; However, since they will not encapsulate a coin they know to be fake, they <i>do</i> offer one layer of protection and professional opinion.&nbsp; Also note that slabs for ancient coins are controversial and disliked by most traditionalists, though they can certainly help boost the resale value if you&#039;re selling via auction sites like eBay.&nbsp; I do slab my own ancients with NGC, personally, but mostly just because the rest of my collection is in slabs, and I&#039;m admittedly in the minority there.[/QUOTE]</p><p><br /></p>

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