In this case, the planchet shifted relative to the die during striking (or vice versa), causing part of the design to get smeared a bit. It's very common and does not carry a premium. In fact, it's sometimes so common that a coin without any Machine Doubling might carry a premium for being a more attractive, better quality strike.
well if you had a magnifying class of a jewelers loupe you could look at the date and see if there is any doubling but other then that this is just a nice VF Mercury dime.
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