Machine Doubling

[coop]

On machine doubling there are no set rules. Inside the same original roll you may find examples that differ from strike to strike that have the same markers on them. sometimes on letter is affected, other times many letters will be damaged. Just depends on the strike. Another point of interest, the 1968-1971 years seems to have the most coins affected with the most strongest examples. But it seems that any year can experience them also most countires experiance. The the mints, they are within tollerance. Just very common and always makes you think you have found something. The surefire way to tell if you have one is that the devices seem to affect the middle edges of the devices with a smeared shelf look. Very rarely do you see notches on the corners of the devices. Just the damage that is left. I save them just for educational purposes. Incase some one need an example, I just go back to the tubes and pull out an example that someone is describing, and post an image. Seems to be easier to explain with an image.