No US Mint has ever struck a 25 cent gold coin.
The US has never minted gold quarters. A private company took genuine proof quarters and plated them with a thin layer of gold. Unfortunately that means they're altered coins and have lost any numismatic value they had as proofs.
yes
no
The US Mint has never made any gold quarters, it's a novelty coin that's been plated and has no collectible value.
Milligrams. The gold on them is worthless.
Common state quarters contain 0 silver, however there were special silver proof sets made for collectors, also some of the home shopping channels sold quarters plated in gold,silver & platinum.
If they're genuine U.S. quarters, then yes, they're legal tender at face value.
None. Zero.
There are four quarters of a mile in a mile. There are four quarters in any whole.
It's not gold, just gold-plated. Private companies take ordinary quarters, plate them with a thin layer of gold, and sell them as "collectibles" at a significant markup. They're interesting curiosities but don't have any special value to coin collectors.
There are four quarters in an NFL game, there are 4 quarters to an NFL season. there are 4 quarters to any 1 whole.
michael carruth in 1992