It was probably caught in a counting machine.
a 1981 dime is 1-12 dollares
The ridges around the edge of a dime is called reeding or milling. There are 118 ridges.
A dime has 118 grooves
The unit you should use to measure the thin edge of a dime would be millimeters.
A U.S. dime has 118 ridges, also known as reeding, around its edge. These ridges are designed to prevent coin shaving and counterfeiting. The reeding also helps distinguish the dime from other coins with a smooth edge.
According to the US Mint, a dime has 118 reeds/ridges.
According to the U.S. Mint, a dime has 118 reeds (grooves).
According to the U.S. Mint, a dime has 118 reeds (grooves).
10 cents.
118 ridges are on a dimes edge
A blank dime planchet is worth about $1 if it does not have a raised rim, or about $2 if it has a raised edge like the edge of a normal dime. FWIW, coins are "struck" rather than "stamped". Just coin jargon, that's all.
I have a Canadian Dime 1980 with smooth edges too but have no idea how much it is worth