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<p>[QUOTE="desertgem, post: 2994961, member: 15199"]Remember that there has been changes in the production of dies for coinage from the older traditional multi-transfers of the image in the hubbing process and the newer more modern and theoretically "better" ( less expensive in gov. speak) single squeeze process of die manufacture. And the mint mark is engraved directly on the die along with the design ( as all of this was done from computer design and computer controlled engraving devices, so the newer process can not have a legitimate RPM ) and all the mints had to change for the mark was a small part of the code. This has produced problems in the definition of DD ( doubled die) in the 2 eras, as the old well known DD such as the 55/55, 72/72, lincolns was cause by true hub doubling, whereas the so called DD of newer single squeeze process is due to mechanical chatter in production. So it should be called Mechanical doubling, but due to profitability efforts, it is called DD also but many ( and yes I am biased ) consider it just MDD. There is a lot of confusion with many numismatic areas, unfortunately much is monetary value oriented. IMO Jim[/QUOTE]</p><p><br /></p>
[QUOTE="desertgem, post: 2994961, member: 15199"]Remember that there has been changes in the production of dies for coinage from the older traditional multi-transfers of the image in the hubbing process and the newer more modern and theoretically "better" ( less expensive in gov. speak) single squeeze process of die manufacture. And the mint mark is engraved directly on the die along with the design ( as all of this was done from computer design and computer controlled engraving devices, so the newer process can not have a legitimate RPM ) and all the mints had to change for the mark was a small part of the code. This has produced problems in the definition of DD ( doubled die) in the 2 eras, as the old well known DD such as the 55/55, 72/72, lincolns was cause by true hub doubling, whereas the so called DD of newer single squeeze process is due to mechanical chatter in production. So it should be called Mechanical doubling, but due to profitability efforts, it is called DD also but many ( and yes I am biased ) consider it just MDD. There is a lot of confusion with many numismatic areas, unfortunately much is monetary value oriented. IMO Jim[/QUOTE]
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