What are these collector coin ratings?

Answer 1

If you mean the grading here is a quick explanation:

There are 2 ways of describing a coin (in the US, Europe and most other countries use a different scale), using the 70 point scale or simply describing the coin.

At the top is 60-70, these coins are known as mint state, uncirculated, occasionally people will call these coins BU (Brilliant Uncirculated) or FDC (Fluer de Coin, a perfect coin, usually used in Europe). These coins will have no trace of wear. All coins with a number from 60-70 are uncirculated, 70 being absolutely perfect (reputable grading services rarely give out a perfect 70) going lower until a 60 which is a coin without wear but several distracting "bag marks" (scratches or dings on the coin from being hit by other coins).

50-58 is known as "about uncirculated" (AU), these coins often look better to the untrained eye or without magnification than low grade mint state coins (such as a 60 or 61) these coins will have traces of wear on the highest part of the coin.

40-45 is known as "extra fine" (EF), these coins have all the features still there but more wear than an about uncirculated coin. People often describe them as XF (extremely fine). Generally when the numeric scale is not used, people will use + to indicate that it is the top of the grade. For example, a XF+ coin is very close to an about uncirculated coin.

20-35 is known as "very fine" (VF), these coins still have all the major features still there but even more wear.

12-15 is known as "fine" (F), these coins have all the major features still there, but some things may start to be fading with wear.

8-10 is known as "very good" (VG), these coins have most of the major features but a lot of evidence of fading.

4-6 is known as "good" (G), this is considered by many to be the lowest collectable grade. Such coins are worn, but are still easily identifiable and they have a full rim.

3 is known as "about good" (AG), the coin's rim is almost gone and perhaps only the date and a faint outline of the major features are left.

2 is known as "fair", few collectors will buy a fair coin, most of the numbers in the date are gone and the coin is pretty much entirely worn slick.

1 is known as "poor", this coin has no features left on it and the date and identification on it can only be made by comparing the diameter, weight and metal the coin is struck on and see if it is a 1 year type. Once a coin reaches "poor" it is little more than scrap metal.