It means the front side the "heads" of the coin. The reverse is the opposite end often called the "tails" of a 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
In coin collecting, it means Brilliant Uncirculated, a very nice coin, but not as good as a Proof coin.
A coin described as "Premium Quality" is an above average example.
It depends what you mean when you say "the image is upside down":-- If you mean that the front (or obverse) of the coin is upside down relative to the back (or reverse) of the coin when rotated around a vertical axis, this is called coin orientation (as versus medal orientation, in which both the obverse and reverse are oriented the same way) and is how the coin is (and indeed, how all US coins are) supposed to be minted.-- If you mean that the portrait on the obverse is upside down relative to the wording and date on the obverse, then you are describing an error that should not be possible given how the coin dies are produced.-- If you mean that there are two images of the portrait on the obverse, one upside down relative to the other, this would be a double struck error, and would have value to an error collector (especially as such error usually have the second striking more or less aligned with the first).-- If you mean that there is a shadow of an inverse (that is, mirror image) of the portrait on the reverse of the coin, this is called a brockage error and has value to a collector of coin errors.
The front of the coin is called the obverse, the back of the coin is called the reverse.- More -It's not always possible to know what characterizes "front" or "back", though. In most cases the obverse of a coin carries a portrait or similar image, while the reverse has the denomination and possibly a less-specific picture. However common usage can sometimes trump those rules. For example, most coins of the British Commonwealth carry the monarch's picture on one side and a denomination-specific design on the other. So by definition the side with the monarch is the obverse, but in practice most people treat the opposite side as the coin's front! European coins have a shared design on one side and a country-specific design on the other; the EU avoids the whole obverse/reverse issue by referring to the coins' "common side" and "national side".
OBV is the abbreviation of "Obverse" or the front of any coin. For Walking Liberty halves, this likely is calling attention to obverse mintmarks on the 1916 & 1917 issues.
For a coin with a given obverse, the reverse may change over a period of time. Coins of British Commonwealth countries for example, have Queen Elizabeth II on the obverse. As she has aged, her portrait is updated every 15 to 20 years, so you have first portrait, second portrait, third portrait, etc. A coin with an unchanging obverse, such as the US one cent coin, may change the design on the reverse periodically so, you have first reverse, second reverse, third reverse, etc. These terms should not be confused with first issue, second issue, etc. when the design of the entire coin is changed, possibly including its size and metallic construction.
If you mean the obverse is missing? It's likely been altered, but take to a coin dealer to be sure.
FG are the initials of Frank Gasparro, he disigned the reverse of the coin. Gilroy Roberts did the obverse.
It means "premium quality". It is not an official form of grading.
You just stand there and watch it (in case it makes a break for the door). You possibly mean "obverse" rather "observe". The "obverse" of a coin is the front, usually the side with the King, Queen or president on it. The "reverse" of a coin is the back. The only other surface a coin has is the edge, which many people forget about or ignore. The edge of a coin can be smooth, milled, have interrupted milling or even grooves. There can often be some sort of inscription on the edge of a coin.