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[Game] World Coins Time Machine… Counting Backward by Year! (Plus Prize Coin)
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<p>[QUOTE="Jimski, post: 3018005, member: 77373"]Thanks for the feedback [USER=77704]@panzerman[/USER] . I wanted to add this following addendum to my earlier post (<a href="https://www.cointalk.com/threads/game-world-coins-time-machine%E2%80%A6-counting-backward-by-year-plus-prize-coin.298151/page-135#post-3015346" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/game-world-coins-time-machine%E2%80%A6-counting-backward-by-year-plus-prize-coin.298151/page-135#post-3015346">#2695</a>). I think it’s very enlightening.</p><p><br /></p><p><b>Evidence on my coin that a thin steel strip with letter cutouts was used on my coin to impress the edge letters during the strike? </b></p><p><br /></p><p>If you look at the snippet from one of my previous photos (below) that “line” under red arrow lies between the first and last letter in the legend, and I think that the line is coin metal squeezed between the 2 edges of a strip of (spring) steel during the strike. The opposite ends of the steel strip could not overlap, so there had to be some clearance designed into the strip to ensure this for all tolerance of planchets. The ends shouldn’t be butted together.</p><p><br /></p><p><br /></p><p>[ATTACH=full]749721[/ATTACH]</p><p><b>Evidence of the use of a Castaing machine on the Royal Mint milled halfcrowns?</b></p><p><br /></p><p>According to a Wikipedia: “A copy of Castaing's machine was put into use at the British Royal Mint” (1), but no date is given. Castaing’s machine was first used in France about 1688, (1) so it would have to be sometime after that.</p><p><br /></p><p>I checked my collection and found that</p><p>• The halfcrown of 1698 (like the 1675) has the line (and dots, as in the photo above)</p><p>• The later halfcrowns of 1707 and 1745 do not have the line. They both look as below.</p><p><br /></p><p>[ATTACH=full]749722[/ATTACH]</p><p>Could it be that top photo illustrates that a metal strip was used for lettering during the strike, and that it was in use from at least 1675 to 1698? And could it be that by 1707 the Royal Mint was using a Castaing machine to (apply the edge lettering to planchets, which were then struck without collars)? The Castaing machine could roll the planchet edge over slightly more than 360 degrees to eliminate any discontinuity.</p><p><br /></p><p>(1) <a href="https://en.wikipedia.org/wiki/Castaing_machine" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Castaing_machine" rel="nofollow">https://en.wikipedia.org/wiki/Castaing_machine</a>[/QUOTE]</p><p><br /></p>
[QUOTE="Jimski, post: 3018005, member: 77373"]Thanks for the feedback [USER=77704]@panzerman[/USER] . I wanted to add this following addendum to my earlier post ([URL='https://www.cointalk.com/threads/game-world-coins-time-machine%E2%80%A6-counting-backward-by-year-plus-prize-coin.298151/page-135#post-3015346']#2695[/URL]). I think it’s very enlightening. [B]Evidence on my coin that a thin steel strip with letter cutouts was used on my coin to impress the edge letters during the strike? [/B] If you look at the snippet from one of my previous photos (below) that “line” under red arrow lies between the first and last letter in the legend, and I think that the line is coin metal squeezed between the 2 edges of a strip of (spring) steel during the strike. The opposite ends of the steel strip could not overlap, so there had to be some clearance designed into the strip to ensure this for all tolerance of planchets. The ends shouldn’t be butted together. [ATTACH=full]749721[/ATTACH] [B]Evidence of the use of a Castaing machine on the Royal Mint milled halfcrowns?[/B] According to a Wikipedia: “A copy of Castaing's machine was put into use at the British Royal Mint” (1), but no date is given. Castaing’s machine was first used in France about 1688, (1) so it would have to be sometime after that. I checked my collection and found that • The halfcrown of 1698 (like the 1675) has the line (and dots, as in the photo above) • The later halfcrowns of 1707 and 1745 do not have the line. They both look as below. [ATTACH=full]749722[/ATTACH] Could it be that top photo illustrates that a metal strip was used for lettering during the strike, and that it was in use from at least 1675 to 1698? And could it be that by 1707 the Royal Mint was using a Castaing machine to (apply the edge lettering to planchets, which were then struck without collars)? The Castaing machine could roll the planchet edge over slightly more than 360 degrees to eliminate any discontinuity. (1) [url]https://en.wikipedia.org/wiki/Castaing_machine[/url][/QUOTE]
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[Game] World Coins Time Machine… Counting Backward by Year! (Plus Prize Coin)
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