Talk about a bar with a lot of history! In 1939 Nicholas Deak emigrated to the United States and opened up Deak & Company, a foreign currency exchange firm. During World War II, Deal had some time to to the CIA, but details are if course a bit sketchy as to what he was doing for them. The CIA might have even been a financial backer for his company at one point.
After the war, they expanded into precious metals, and over the years faced allegations of money laundering, bribery, and smuggling. So they declare bankruptcy in 1984. But then the story gets weird. In 1985, a crazy homeless wonan busts in to their offices and shoots Mr. Deak, killing him. But afterwards it turns out that maybe this woman isn't what she appears to be. Maybe it was an assassination. No one really knows for sure. If you have some time, this article from 2012 is an interesting read.
But all that aside it's a really nice bar. Check out that patina!
And the stamp and the serial number distinguish it further. The MA is for Metal Arts Co. , who minted the bar, but I'm not sure of the year.