Added mint marks
How in the world do counterfeiters cut or remove a mint mark from one coin and attach it to another? I'm pretty handy but to do something so delicate like that is mindboggling. The only way I can think of might be with a laser.
Remember, I'm pullen for ya; we're all in this together.---Red Green---
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There are also some outdated microsurgery reduction rigs that could be used for the purpose but thats just speculation. Many times a common date with the right mintmark will be sacrificed. I think the 1917-D merc mintmark is the same as the 16-d.
In my experience, the vast majority of added mintmarks are manufactured by the alteration expert, not removed from other coins.
There is the famous story of one such operation that was raided by the authorities. They located "cookie sheets full of fake mint marks"
in the person's kitchen. Since nearly every fake 1916-D dime I have ever seen has a wrong style added mintmark, I have to assume that
there are very few cases where the mintmark is removed from one coin and attached to another.