Posted By:
Joe D.is that the cards were printed over years.... not all at one time.
Maybe not the first run, the second run or the third run....
but I would be very surprised if the printing company went through more than three 'orders' of cards before they realized they should print the backs and have them ready for future orders.
So, by the time '460' were around... there must have been a nice inventory of pre-printed backs paper ready to go.... or they were not too bright.