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<p>[QUOTE=&quot;Oldhoopster, post: 2674758, member: 84179&quot;]Q1: If we knew, we wouldn&#039;t&nbsp; be schlepping around on CT talking about circulation finds <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie47" alt=":greedy:" unselectable="on" unselectable="on" /></p><p>Q2:&nbsp; Weight will tell you if it&#039;s zinc or copper.&nbsp; Every so often, the master hubs (I think that&#039;s what they are called) are updated.&nbsp; For ex., you can definitely see the changes made between 1968 and 1969.&nbsp; I believe this was done in the 90&#039;s or 00&#039;s as well, so that might also be a clue.&nbsp; As to the exact year; that may not be possible.[/QUOTE]</p><p><br /></p>

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