The most counterfeited dollar bill of all time is the $20 bill. It is one of the most commonly used denominations in circulation, making it a popular choice for counterfeiters.
Everything can be counterfeited.
Pass counterfeited
$20
The 1840 date is suspicious. It's one of the most frequently counterfeited dates for early US paper money so you will have to take your bill to an expert who can evaluate it in person.
A very good question. All key-date collectible coins have been counterfeited for many years, that's the simple answer. As to the most, all one & three dollar gold coins struck by the US have been counterfeited and all Trade Dollars also.
Yes.
Two dollar bills generally are not counterfeited, so odds are it's genuine. If you're not sure, take a close look at the paper. A real bill will have tiny red and blue fibers embedded in the material.
First you have to find out if it's real. A lot of early currency has been widely copied and counterfeited. The only way to tell is to have the bill inspected in person by a paper money expert such as a dealer or appraiser.
There should be, but that can be counterfeited too.
Capable of being falsified, counterfeited, or corrupted.
Need more info since they aren't counterfeited.