I bet it's not "dateless".
It is a '13-S type I but with so little wear it should have what we used to call a "one digit date". This is just enough to identify the date. As such it's in Fr to P condition and used to trade at about 1/2 of the AG price which was half of the G price.
A two digit date will grade AG or G.
Time don't fly, it bounds and leaps.