Using a bright light and an eye loupe, if you tilt the coin around you will find an angle where the numbers appear.
You don't need nickadate to find a dateless 1916 ddo. The Doubling in the feathers shows even in the lowest grade.
I can see the first two digits "19", but I still can't make out the last two yet. I think the very last number is 3, 5, 6, 8, or 9.