It's not clear what you mean by "double dated"
If you have a quarter, half, or dollar with the double date 1776-1976 it is a Bicentennial celebration coin. These were minted in huge quantities so unless it is a proof coin it its original package, it's only worth face value.
If you have a "coin" with the same face on both sides and 2 different dates, it's a novelty item with no value to collectors.
If you have something other than these 2 possibilities, please post a new question with more details.
The dual dated Eisenhower dollars are face value only.
It's a common coin, still worth one dollar.
what is the value
The value for the Malaysian KM2 Sen coin dated 1968 depends on its condition. As of 2014 this coin sells for between 3.00 and 5.00.
poti
bilat
It really depends on which coin dated 1886 you're asking about
The US has never made a 10000 coin.
As of today bullion value is $6.30 for this coin a uncirculated coin is about $10.00.
The coin you have described, dated 1805 with the inscription "dei gratia carolus IIII", is a Spanish colonial coin. The value of this coin can vary depending on its condition, rarity, and demand among collectors. It is recommended to have the coin appraised by a professional numismatist to determine its exact value.
the valu of the coin is $80 to $120
It is of no monetary value like the quarter, He has a bio coin