Ruler of Oman's dollar ..... 1834

 there a story behind that dollar ,,,,, the  ruler of oman dollar one of the rarest coins in the world ,

has been sold $ 4 million in 1999 at auction in New York , the story behind that dollar start of 

america the instrument set of silver dollars allocated for distribution to some of the princes of the world,

and America wanted to give them the oldest coins she have , and the 1834 ,

changed the date of which  8 dollars of it to become the 1804 instead of 1834 and the cause is unknown,

for this is that the dollar is very rare I mean of  dollar of 1804