The coin has two "tones" because it's bi-metallic. The outer ring is copper-nickel and the inner core is brass. The US is one of the few countries that doesn't make bi-metallic coins so those from other countries may seem unusual.
In any case the Canadian "Twonie" (or "toonie") is a common circulation coin so if you found it in change it's only worth face value.
About $1.80 U.S.
about $10
Without further details, the best possible answer is that it's worth one dollar.
$2
The value of an 1879 Canadian dollar depends on its condition. Such a coin in good condition is valued at about 24.82 US dollars while an uncirculated coin is valued at 42.88 US dollars.
f you want to know the value of a Canadian 1964 1 dollar coin, you need to know that is a silver coin. The minimum value is 10$. If the coin have never circulated, you can find the value according the the grade here : http://www.coinsandcanada.com/coins-prices.php?coin=1-dollar-1964&years=1-dollar-1953-2010
It's worth $2
It's worth exactly one dollar in Canada.
Unless it's in brand-new uncirculated condition, face value only.
There is no such coin. Canada did not have any coins over 50 cents in 1871.
55 in Philippine pesos
Whether it's a US Anthony dollar or a Canadian "loonie", it's only worth face value.
Please post a new question with the coin's date.