The first time a given card is ever sold on Harmony, its token is marked 1st Edition. One per card, not per grade and not per copy: the first Dragonite #290 to sell here carries it, and no other Dragonite #290 ever will, whatever grade it holds.
It is provenance, not a discount. It records that this token opened the market for that card on this site, and once it is claimed it cannot be recreated.