(Today, these dimes are referred to as Mercury Dimes.) President Roosevelt ... This is the first proof coin that was mistakenly struck without the mint mark, and only about 12 such coins are ...

Some dimes are worth hundreds or thousands of dollars, and a small handful could be worth more than $1 million. Here's what ...

So, the mint superintendent reportedly had a tiny sum of 24 proof dimes bearing the 1894 date, and “S” mintmark, struck to balance the books. He then gave many of these dimes to his close ...