The running joke is that "Good, isn't". G (or G4) means that a coin has a recognizable date and mint mark (if any) and all major details are visible, but the coin is otherwise quite worn down.
Except for extremely rare coins, "Good" is considered the lowest collectible grade.
In coin collecting, it means Brilliant Uncirculated, a very nice coin, but not as good as a Proof coin.
Lots of wear on the coin and the lowest grading possible.
edge of a coin with grooved lines that run around the entire perimeter of the coin
A coin described as "Premium Quality" is an above average example.
It means the front side the "heads" of the coin. The reverse is the opposite end often called the "tails" of a coin.
A coin collection is called, well, a coin collection. The hobby of collecting coins is called numismatics.
a coin collector
It means "premium quality". It is not an official form of grading.
A coin which has "circulated" shows evidence of use in commerce, such as luster interruption, wear, circulation marks, dirt, etc. Conversely, an "uncirculated" coin displays no such evidence.
Coin collecting
While the president has not said much about coin collecting, he has said a lot about education and about the importance of hobbies that are educational. Both stamp collecting and coin collecting teach about geography and about important historical figures, so the chances are, he would be in favor of such hobbies.
In coin collecting, G-4 refers to a specific grade on the Sheldon scale, which measures the condition of coins. A coin graded G-4 is considered to be in "Good" condition, showing significant wear but still retaining some details and recognizable features. In this grade, the coin may have a heavily worn surface with most of the design elements visible but lacking sharpness. Collectors use these grades to assess the value and desirability of coins.