Another member sent an image of a different panel, posted here. I suspect these nine cards at near the bottom right edge of one of the slits.
69series7_9cards.jpg
Series 7 has 77 cards, so the most likely pattern is 4 rows 3x each (SPs) plus 3 rows 4x each.
Still looking for miscuts so that the edge cards (both leading and trailing) can be identified. Found this miscut of #616 that suggests it is a top row of one slit.
1969_616_T.jpg
And found this miscut of Murcer,, #657, which indicates it is above Held, #636.
1969_657.jpg