PF-69 is not a value, it's a grade. But it does affect the value, the higher the grade the more value a coin has. A PF-69 coin is one grade below a "Perfect" proof coin.
pf means proof! and 69 is the grade. grade from 1-70.
Gold was fixed at £832 a Troy Ounce on 1st October 2010 in London. Your coin, assuming it is gold and probably alloyed with copper i.e. 22 carat, is worth around £900 - £1000. PF69 refers to Proof 69 (69 out of 70 as the highest known grade) and probably slabbed as such. It may have slightly more value from a numismatic viewpoint although as it is a modern issue this is highly unlikely.
It increases the value on the coin.
Face value The value stamped on it
For a coin it is just worth the value stamped on it i.e. the value on it's face So a common coin is worth face value, but a rare coin is worth more than face value.
Do you mean minotaur ?
South African rand
If you mean an 1853 $1 gold coin value can be $125.00 to $270.00 for a circulated coin. And more than $300.00 for uncirculated coins.
Assuming you mean a €0.01 coin, face value only.
There are two basic meanings to the term "trends" in terms of coin collecting. Both relate to the resale value of a coin. #Trends can refer to the general tendency for a coin's value to increase or decrease. Value trends for gold coinage, for example, are currently (as of 6/21/2007) rising, simply because gold itself is increasing in value. Value trends for recent US Proof sets, though, are dropping. #Trends is the old name for Coin World's coin value column. Thus the phrase "Trends at $37,000" would mean that the value according to "Coin World Trends" has been around $37,000. Recently the column has changed to Coin World Values and has spun off into its own publication.
I think you mean a "Clipped Planchet" coin. All error coins need to be seen. Take to a collector or coin dealer for an idea of value.
If you mean a Half ounce $25.00 American Eagle Bullion coin the value is half the spot price of gold at time of sale. As of today value is $569.00