Message:

<p>[QUOTE=&quot;profiler, post: 2212737, member: 73718&quot;]Allan, a doubled die comes from a strike to planchet where the doubling is actually on the die. Each subsequent coin from the same die will have the same doubling (and over the life-cycle of the die, will change slight during early, mid, late, and very late stage impressions). </p><p><br /></p><p>Die doubling is rounded and <i>increases </i>the size of the doubled devices (letters, numerals, etc.) It is often notched at the corners but doesn&#039;t have to be.</p><p><br /></p><p>Mechanical doubling (MD or MDD, machine doubling damage) is broad term for doubling or other distortions of devices that does <i>NOT </i>originate from the die, itself. There are three types: die chatter (when the die bounces); ejection doubling (when coin is improperly ejected); and the most common, strike doubling (when the die lifts off the coin and the coin moves and is struck again).</p><p><br /></p><p>The hallmark signs of MD are that it&#039;s flat and shelf-like and instead of the devices being enlarged (i.e. &quot;doubled), the devices are narrower or smaller.</p><p><br /></p><p>There are many nice comparative illustrations of the two online.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in