It will happen once every 100 years.
September 9th will occur once a year, and the '09 year will happen in 2009, 2109, 2209, etc.
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A coincidence
Yes, plus one month of course. This will cease for a while in 2012
It depends when exactly they were born and the date today
Leucippus is best known as being one of the earliest Greeks to develop the the atomism theory. His main interest was metaphysics, and he has no exact recorded birthday or death date.
If it's so worn that it has no letters or numbers it shouldn't be possible to see a date. However if the date is barely visible it may still be worth a few dollars, but it would have to be graded more exactly. 1871 three-cent nickels are moderately rare.