For most coin series - 1908 and before - Dates were hand-punched into the individual working dies. Established coin series continuing through 1909 and after - the entire date was hand-punched into the year's master die. Coin series adopted in 1909 and after - the 1st two digits of the date originated from the galvano transferred to the master hub with the last two digits of the date punched into the year's master die.
on Inidanvarieties.com ...it says its RPD-002 surprised someone didn't clean out the junk in the "9" before the picture was taken
Looks like a 9/9 as there are no other traces of another number. If that was a 9/8, it would be one of history's weirdest overdates, as it would be a 1908/18??.
Not to intrude on an interesting thread, but do you mean something like a 500 year overdate? 1836/1336 bust half
Well, @okbustchaser, that's darn interesting! I pulled out my Overton 3rd edition and see that's O-108, "8 over an erroneously cut previous 3." I like your interpretation better - someone dug up a 500 year old die and reused it!