If by "mark" you mean "mint mark", all it means is that the coin was struck at Philadelphia in the years before that mint started using the current "P" mint mark.
Until 1979, the only Philadelphia coins to ever carry a mint mark were the special wartime nickels minted from mid-1942 to the end of 1945. In 1979, the P mark was added to $1 coins and in 1980 it was added to all other denominations except pennies.
Cents made at Philadelphia still don't have mint marks, because when demand is high the San Francisco or West Point Mints are pressed into service. Those mints are much smaller than Philadelphia. To avoid instant rarities their cents are also made without mint marks which means they can't be distinguished from Philadelphia cents.
If a coin has no mark at all on one or both sides, it is likely to be either a defective coin or a counterfeit. In either case, its value would be significantly diminished or nonexistent. It is advisable to consult with a professional coin collector or dealer to evaluate and authenticate the coin if it appears to have no marking on either side.
All error coins need to be seen. Take it to a coin dealer in your area.
This is a novelty or magic coin that has been altered and was not produced by the mint And has no collection value at all.
A square and a rhombus both have all sides equal and opposite sides parallel.
No, both shapes have all four sides equal.
Every quadrilateral has four sides and they are opposite each other. So, ALL quadrilaterals have both pairs of opposite sides.
All error coins need to be seen. Take it to a coin dealer in your area.
It's a trick or magic coin an has little or no value.
This is a novelty or magic coin that has been altered and was not produced by the mint And has no collection value at all.
One coin has two sides. Just like that, the whole truth often has two sides.
The mint mark on all modern presidential dollars is on the edge of the coin, along with the date and the motto E PLURIBUS UNUM.
All depends on year and mint mark
Yes, compromise means that both sides (or all sides) in a conflict give something.
A square and a rhombus both have all sides equal and opposite sides parallel.
The mint mark (if it has one) on all Morgan (1878-1904 & 1921) silver dollars is on the reverse of the coin, just above the letters "DO" in dollar.
A trapezoid.
Normally you have to know a coin's denomination to locate the mint mark because it can be in different places. Also, Philadelphia did not use a mint mark on most coins until 1980 so it's very possible your coin doesn't have a mint mark. Once you know the denomination you can check a site such as www.coinfacts.com that shows the mint mark locations for all US coins.
They are both quadrilaterals with 4 equal sides.