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<p>[QUOTE=&quot;Burton Strauss III, post: 8327220, member: 59677&quot;]I have at least six different INSAB styles... including one of the polaroids.</p><p><br /></p><p>[USER=73995]@Pickin and Grinin[/USER] that is Conder101&#039;s INS-4,</p><p><a href="https://boards.ngccoin.com/topic/138429-what-is-ins-big-scans-added-for-conder/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://boards.ngccoin.com/topic/138429-what-is-ins-big-scans-added-for-conder/" rel="nofollow">https://boards.ngccoin.com/topic/138429-what-is-ins-big-scans-added-for-conder/</a></p><p><br /></p><p>The INSAB slab was used by (at least) PCI, Global and INGS (International Numismatic Grading Service). As a two-chamber slab, it worked around the Accugrade three-chamber slab patent. This doesn&#039;t mean it was/was not provided to INSAB by Accugrade as Conder101 says, just that it didn&#039;t have to be.</p><p><br /></p><p>INS-3 (w/o cert# on the back)</p><p>[ATTACH=full]1475784[/ATTACH] </p><p>[ATTACH=full]1475785[/ATTACH]</p><p><br /></p><p>Note that your example has TWO different Cert#s in different ranges. My INS-4 is an 1893 Columbian half, with just a 71640-10 cert#:</p><p>[ATTACH=full]1475783[/ATTACH]</p><p><br /></p><p><br /></p><p>INS-5 (rare)</p><p>[ATTACH=full]1475779[/ATTACH] </p><p>[ATTACH=full]1475780[/ATTACH]</p><p><br /></p><p>INS-6 (unique)</p><p>[ATTACH=full]1475781[/ATTACH] </p><p>[ATTACH=full]1475782[/ATTACH]</p><p><br /></p><p>Unlisted (an intriguing one, listing the seller (CoinVault, In. AND INSAB):</p><p>[ATTACH=full]1475786[/ATTACH] </p><p>[ATTACH=full]1475787[/ATTACH]</p><p><br /></p><p>Correspondence between EPN and Charles Hoskins: <a href="https://archive.org/details/internationalnumismaticsocietyauthentication1981to82epncorr/page/n3/mode/2up" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://archive.org/details/internationalnumismaticsocietyauthentication1981to82epncorr/page/n3/mode/2up" rel="nofollow">https://archive.org/details/internationalnumismaticsocietyauthentication1981to82epncorr/page/n3/mode/2up</a></p><p><br /></p><p>Finally, an interview with Charles Hoskins about INSAB: <a href="https://archive.org/details/centinel33n0cent/page/14/mode/2up" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://archive.org/details/centinel33n0cent/page/14/mode/2up" rel="nofollow">https://archive.org/details/centinel33n0cent/page/14/mode/2up</a>[/QUOTE]</p><p><br /></p>

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