How much is a real double sided quarter with 1985 on one side and 1995 on the other worth?
Why and how do you know it's real?
1. The mint uses dies that are keyed so that two fronts or backs can't be put into a press at the same time 2. What are the chances that a coin would leave the mint in 1985, find its way back 10 years later, and get struck with a new date on one side only? 3. Each year's dies are destroyed at the end of the run, so a 2-date combination can't be made by a rogue employee. Bottom line - you have a privately-manufactured magician's coin worth nothing to a coin collector.
A quarter used to have 25 cents worth of silver in it now it has 2 cents worth of copper are you getting ripped off?
How much is a double headed quarter from 1991 with eradicane on one side and fusilade on the other worth?
You have an altered coin worth maybe a dollar as a novelty item. I have one of these coins. It is not an altered coin. It is thicker and larger thana US quarter. Since both names on this coin are names of products by the Syngenta company, I would suspect this is some kind of advertising coin for their products.
The 1850 quarter is worth approximately $400. The amount will vary depending upon the condition of the coin and the seller of the coin. If by chance the date 1850 is directly below the word "California," and George Washington is on the other side, then what you have is actually a 2005 state quarter, and it's worth 25 cents.
Unless there is some sort of double-strike or other interesting flaw in the coin, it's worth 25 cents. No relatively modern coin is worth any more than its face value. Please check your pocket change. Unless there's something to make it different from the 4.8 billion other quarters minted that year, it's only worth 25 cents.