I think you mean "Obverse", which refers to the front of the coin (usually, but not always, the side with the portrait or coat of arms), as versus the "Reverse", which refers to the back of the coin.
The observe of a coin is the front side, typically featuring a portrait, emblem, or inscription. It is also known as the "heads" side of the coin.
Slap, pull, observe, release, tap, and shoot
IF you're referring to U.S. coins, face value only - 25 cents.
You must elaborate. To which time period are you referring when you say, "did they..."?
Assuming you are referring to a 22-coin set of uncirculated coins, it currently is worth about $325.00
Which queen? What pictures? Where? If you're talking about her portrait on coins, which country are you referring to?
If you are referring to coins, you can find loads of photos at a site such as www.coinfacts.com
That depends on which coins and which years you are referring to -- it could be Eisenhower dollars (1971-1976), bicentennial coins, or modern silver proofs. Can you be more specific?
Depends on the currency that you are referring to.
Please post a new question with the name of the country you're referring to.
Coins in Western countries have been made of metal for centuries. Please post a new question with the name of the specific country or countries you're referring to.
Your question isn't clear. Are you referring to counter-fiet coins? These are coins made illegally for profit. They are considered fake as they are not minted officially.
Assuming you mean quarters and are referring to coins then 400