I will admit thats the wildest Machine doubling I believe I've ever seen! Neat find even thought it isn't what was hoped for.
I would agree with the machine doubling and here is a web site that might help you and others going forward. http://doubleddie.com/1801.html
Joven, check out this guy's videos on YouTube. He's a coin dealer, and the importance of his videos are the (online) resources that he uses, which he shares with his audience. These may also help you with the difference between MD and DD and other topics. I've enjoyed watching his informative videos, and he's reasonably entertaining.