Well it is Machine Doubling. While it only affects the tops of the devices is because of the a high bounce. But why is it not a doubled die? Because of the devices are normal in size. The affected areas are reduced. No spread on the devices. On the DDR, there would be spread:
1968-D DDR-001 FS-801



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Because of the high bounce the Machine Doubling affected just the tops of the devices.
1968-D DDR-001 FS-801



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Because of the high bounce the Machine Doubling affected just the tops of the devices.




























