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<p>[QUOTE=&quot;bhp3rd, post: 498161, member: 16510&quot;]<b>Machine doubling is,,</b></p><p><br /></p><p>Machine doubling, mechanical, shelve, strike, ejection pretty much mean the same thing - the dies works loose, slipped or scooted at or near the milli-second of striking causing a flat shelf like type of doubling not associated with a true doubled die.&nbsp; A true doubled die occurs during hubbing and coveys in the stuck coin a extra image usually directly on top of or slightly ajar of the primary image.&nbsp; A doubled die will show generally thick doubling of devices , numbers, letters with an extra image juxtaposed over the primary image or doubling, usually with splits in the serifs - ie: doubled die - also there are many types (classes) of true doubled dies.&nbsp; There is a very good post on here describing true doubled dies and well worth the read.</p><p>There are no known doubled dies for a 1928-S Lincoln cent - one of my students found and submitted a 1928-P DDO a couple years ago to the Wexler files but no 28-S that I am aware of.</p><p>&nbsp;</p><p>Look at your coin, see the doubling and think to yourself, &quot;does this doubling look scooted, pushed or pulled and are there other area of the coin with the same type of flat shelf like doubling????&nbsp; If the answer is yes you probably have a mechanically doubled coin - ie: the dies worked loose.&nbsp; &quot;Remember a coin struck twice does not a doubled die make&quot;</p><p>Don&#039;t feel bad or over whelmed with all this info. that you may not understand yet - I know dealers who have been in the business for 25 years who can only see &quot;the big ones&quot; (ones in Red Book or Cherry Picker&#039;s) and can&#039;t (for the most part) tell a doubled die from a big brown cows rear.</p><p>I will be glad to help you anytime - A Cherry Pickers Guild would be of major help also as it has chapters specifically devoted to determining true doubled dies from other forms of doubling.</p><p>Hope this helps you.</p><p>&nbsp;</p><p>Ben Peters[/QUOTE]</p><p><br /></p>

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