While the back of the 416 Sullivan get a lot of attention for the circle/no circle and period/no period varieties, I also noticed a difference on the front. Maybe less pronounced than the Drabowsky or Ramos varieties, but this one is definitely repeated.
On some cards the lower left corner of the card is clean orange. On others there is a small rectangle - it almost looks like tape might have been used to hold things together early in production and this made its way onto the card (total speculation ?). Interestingly, I have only ever seen the rectangle on the no circle/no period and no circle/period varieties. Granted I have not seen too many of these. I have seen the circle/period (normal) variety with both the rectangle and a clean corner.
The left side of the scan shows no rectangle, the right side of the scan shows the rectangle.
