The 3rd series is a 110 card series, so we expect 10 rows, with 4 rows printed 3x and 6 rows printed 2x.
I have not reconstructed the 3rd series, nor attempted to ascertain the card numbers from this poor image. But there I think I have enough info to do so.
BTW, I only have half of the 2nd series. The 2nd slit, although a simple 6x2 pattern, hasn't been completed.
1970_series_3_full.JPG