The term "key-date" means a more valuable or scarce coin of the series. But the 1923 issue is not one of them.
There were no $2 bills printed with the date 1923. If you mean 1928, please see the Related Question for more information.
Do you mean, what's it worth? If the coin is in a collectible condition, retail values for circulated coins run from $30.00-$43.00.
If you mean a 1928 Peace dollar with No mint mark It's the key date to the series the value in VF-20 is $475.00. I suggest you take it to a coin dealer, because I have seen many 1928 S mint coins with the mint mark removed.
I assume you mean a silver certificate, not a dollar coin. Values range from $6 if worn, up to about $35 in near-new condition.
If you mean a 1921 high relief Peace dollar. Circulated coins are $125.00-180.00 Mint state coins start at $250.00
What does "binion" mean? It's not in any dictionary. If you have a regular Peace dollar, see this link:
Assuming you mean a 1923-S Peace dollar, a circulated example is $32.00-$39.00. Typical Mint State coins are $43.00-$55.00.
There were no $2 bills printed with the date 1923. If you mean 1928, please see the Related Question for more information.
Do you mean, what's it worth? If the coin is in a collectible condition, retail values for circulated coins run from $30.00-$43.00.
It's the monogram of the designer Anthony de Francisci (AF). All Peace dollars have it.
This is the designers initial.
If you mean a real silver dollar, such as a Morgan or peace dollar the thickness is 2.4mm
If you mean a "Mintmark" it's a letter not a number and the 1922 Peace dollar is the highest mintage most common date of all Peace dollars, retail values are $16.00-$22.00 depending on the grade of the coin.
If you mean the spelling if the word trvst, it's not a mistake all Peace dollars have this and the coin is only worth $16.00-$18.00 depending on how much wear the coin has.
If you mean the series date, it's 1934
If you mean one of the Sacagawea dollars or a Presidential dollar the date is on the edge of the coin and its not gold.
If you mean the dual-date 1776-1976 dollar it's Eisenhower.