Posted 05/08/2021 11:43 am
Machine Doubling is a movement caused by the machine after the strike. Note the area is not raised, not lowered, but moved a bit leaving a level mark. This is common and happens a lot more on the larger diameter coins. This is just very minor though. It get pretty sever sometimes:
If you are looking for RPM and doubled dies, avoid the outsides of devices. That is where you will find Machine Doubling. On a RPM you would expect to see the area showing a rise, not just a slide mark. On a doubled die you would also see the same spread that is a trade mark of a great doubled die. They are raised, not level scuff. The spread is seen on the centers of the devices, not on the edges of them.
Because Machine Doubling is caused by the machine, you can have a doubled die and Machine Doubling on the same strike. The doubled die has the doubling caused by the die, but Machine Doubling can affect a normal die and a doubled die:
Note the aqua arrows, that is pointing to the Machine Doubling. The other areas are hub doubling. Note the hub doubling is showing spread and rounded contour. The Machine Doubling is showing reduction and flatting of the affected areas. So if the contour is gone, it is Machine Doubling or damage to the coin. The white arrows are showing the hub doubling.
If you are looking for RPM and doubled dies, avoid the outsides of devices. That is where you will find Machine Doubling. On a RPM you would expect to see the area showing a rise, not just a slide mark. On a doubled die you would also see the same spread that is a trade mark of a great doubled die. They are raised, not level scuff. The spread is seen on the centers of the devices, not on the edges of them.
Because Machine Doubling is caused by the machine, you can have a doubled die and Machine Doubling on the same strike. The doubled die has the doubling caused by the die, but Machine Doubling can affect a normal die and a doubled die:
Note the aqua arrows, that is pointing to the Machine Doubling. The other areas are hub doubling. Note the hub doubling is showing spread and rounded contour. The Machine Doubling is showing reduction and flatting of the affected areas. So if the contour is gone, it is Machine Doubling or damage to the coin. The white arrows are showing the hub doubling.
Edited by coop
05/08/2021 11:44 am
05/08/2021 11:44 am
