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<p>[QUOTE=&quot;1970 Silver Art, post: 1129844, member: 18828&quot;]Thecigarnut,</p><p><br /></p><p>This bar is part of the Hamilton Mint series called &quot;American Presidents&quot;.&nbsp; According to my 4th edition of the silver art bar guidebook called &quot;An Indexed Guide Book of Silver Art Bars&quot;, there are 39 bars in the Hamilton Mint &quot;America Presidents&quot; series.&nbsp; This series runs from 1974 to 1976.&nbsp; The guidebook also mentions that each bar of this series has a mintage number of 10,000.&nbsp; There is also a gold-plated version of this 1-oz .999 silver art bar and it has a mintage number of 5,000 for each bar.&nbsp; </p><p><br /></p><p>As for cleaning,&nbsp; opinions will vary on this subject.&nbsp; Even though it is bullion and cleaning it will not hurt the actual metal value but it might negatively affect the collector value (the value above silver metal value) on a silver art bar.&nbsp;&nbsp; It is better to err on the side of caution by just leaving it as it is.&nbsp; &nbsp; </p><p><br /></p><p>I am a fan of using airtites on certain silver art bars.&nbsp; I do not have airtites for every silver art bar that I own but I use airtites for a lot of my rare silver art bars because when I bought them, they were in great shape and I wanted to preserve that condition as much as possible and an airtite is the best option for that IMO.&nbsp; The silver bar airtites will fit a standard size silver art bar, however, it might be hard to find an airtite for the Hamilton Mint that you have because the dimensions are not that of a standard silver art bar.&nbsp; You might have some luck finding some airtites on ebay that will fit a Hamilton Mint silver art bar.[/QUOTE]</p><p><br /></p>

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