Looks like it is N0405. My personal opinion is that there are only 2 variations, squared and rounded edges. The dots being centered or not is probably just a "shift" during printing. I believe the dots that TCR is referring too are the ones above and below the wavy line. My site has just the two issues shown and not E0978. If you consider off center dots as a true variety (different issue) then my N0405 could be listed as E0978. Next time I go to Harrahs Laughlin I will examine a rack of $1 chips.