If you refer to the extra "E" between the "N" and the "S", it is as a result of the French spelling of Guernsey (Guernesey) which was used on coins from 1830 until the middle of the 20th century.
No, a genuine Continental currency coin would not have the word "copy" on it. If a coin has "copy" marked on it, it is likely a replica or counterfeit coin. Authentic Continental currency coins were issued during the American Revolution and did not include such markings.
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Just looking at the coin carefully will help. The name of the country might not be in English. For example, a French coin will say Republique Francaise on it, and a Swiss coin will say Confederatio Helvetica. A good coin book will help find the answer.
marina neumann is the one that most say created the first computer in 1830
moneda
Münze
Assuming when you say "double stamped" you mean "double die" [2 images of some of the details of the coin can be seen], there were no double die cents in 1975. However, that does not mean there are not coins on which 2 images of some of the details, like letters or numbers, can be seen. There is what is known as "machine doubling". This happens when the coin presses and dies do not fit together very well, usually because of wear, and when a coin is struck by the die the looseness of the machinery causes the die to bounce just a little and , in effect, strike the coin for a second time. The "bounce" strike would not exactly match the image on the coin from the intended strike and thus parts of the coin appeared doubled. Machine doubling was more common in the early 1980s but it was also seen in the 1970s. This sort of doubling has little if any numismatic value.
A 1955 double stamped penny in very good condition could be worth around $1 to $3, depending on the specifics of the coin and the current market demand. If the coin is in a case or holder, it may have additional value to collectors who appreciate coins being preserved in such a way.
coin dealer in spansih is: distribuidor de moneda
Incomplete question - does not say who 'he' is.
Independence Coin is one coin appraisal service company. Coin appraisal services are just what they say, they let you know how much a coin is really worth. You can get a free coin appraisal on the website Coin Quest.
All indications are that, if this is a genuine flipover double strike, your coin could be worth over $1,000. I suggest you send large magnified pictures to Mike Byers, an error coin dealer, and see what he has to say about it. You can email him at mike@mikebyers.com Good luck!