The 8 is sitting a little too proud on the field. The other digits are worn soft, the way a coin gets when it spent forty years in tills and coffee cans, but that one number is sharp at the edges, standing up out of the surface like it arrived later than the rest of the coin. The luster around it looks disturbed, faint scratches running in a direction the rest of the wear does not. Under the loupe, the shape of the digit is almost right. Almost. That is the word that keeps coming back with these. Almost.
The trouble is that a handful of dates in American coinage are worth many multiples of their common siblings. A 1909 cent is pocket change, a 1909-S VDB pays a mortgage payment. A 1916 dime is fifty cents on a slow day, a 1916-D is a car. The gap between the two is a mint mark the size of a mustard seed, or a single digit on a date. Somebody, somewhere, with a graver and an afternoon and a bad idea, has noticed that gap. And a coin comes across the counter that wants very badly to be the rare one, but was born the common one.
There are two flavors of this, and they show up often enough that you learn the shape of them. The first is a tooled date. A 1948 becomes a 1918 because the 4 got shaved down and pushed into a 1. A 1944 becomes a 1914 the same way. The metal has to go somewhere, so the field around the digit gets low, and the digit itself sits on a little island of disturbance. Look at the field before you look at the number. If the surface dips or ripples right around the date and lies flat everywhere else, the story is written right there. A mint made millions of coins from the same dies, and the fields on a genuine strike are consistent. Uneven metal near one specific place is a hand at work, not a press.
The second flavor is an added mint mark. A plain 1909 cent gets a tiny S glued or soldered under the date, and now it wants to be a 1909-S. A 1916 dime gets a D added to the reverse, and now it wants to be the Denver one. The mint mark's the tell, and it tells on itself two ways. First, the font. Real mint marks were punched from a specific tool in a specific year, and they have a specific shape, serifs, thickness, the little curls. Reference photos exist for every year. A 1916-D dime has a D that leans a particular way. If the D on the coin in your hand does not match the D in the book, something is wrong. Second, the seating. A real mint mark is part of the strike, metal flowing up into the recess of the die, its base blending into the field. An added one sits on top of the field, and under angled light you can often see a seam, a shadow, a hairline of glue or solder where it meets the coin.
The digits themselves have their own tells. On a real coin, all four numbers of the date wear together, because they were struck together and then rode in the same pockets for the same decades. When one digit is crisper than its neighbors, or slightly the wrong height, or slightly the wrong width, the eye picks it up before the brain does. The 8 that stands too proud. The 6 whose loop is a little too round. The 1 that looks like it used to be something else. Sometimes the alteration is old, from the 1940s and 1950s when reference material was thin and a determined amateur could fool a country dealer. Sometimes it is fresh. Either way, the coin does not lie about it. The metal remembers what it used to be.
The habit worth building is the boring one. Before the excitement of a possible key date carries you off, put the coin on the felt and look at three things in order. The rim, the field around the date, the shape of each digit against a photograph of a known-genuine example. If any one of them disagrees with the story the coin is telling, believe the coin, not the story. A common date honestly worn is a real coin with a real history. A common date pretending to be a rare one is a small crime with a smaller payoff, and the tells are almost always there.
So when the 8 sits a little too proud, do not be sad about it. The coin is still copper, still honest at its core, still the thing it was made to be. Set it back on the felt. Move on to the next one. The jar's worth more than you think, and the story's better than the price.