How This Could Be?

Plastic game also have some rules, and it falls in the range of 1 grade above-below, and generally it is predictable. The coin I submitted is in the range 63-64, with slight chances to be 62 and even less 65. Not 61 and not 66.

What is your opinion about this coin.

I know and I crack coins not very often, only when coin is obviously undergraded. In this case it is amazing that this coin could be 61. Even novice collector, not speaking professional grader will grade it 63 at least, as it was graded before. I posted this to inform that NGC is not that great company as its reputation will tell.

as you stated it was graded a long time ago, its according to how long ago to what their standards were at that time. The grading companies are in strict mode right now because they have been catching allot of slack about their lax grading so if they were generous at the time it was submitted the first time and they are strict now I can understand why it is 2 points less than it was the first time

Sometimes, they might think they see something that qualifies it for less. Maybe the strike, too. But it looks a LOT nicer than 61, I would completely agree. 61 coins usually don't look that nice.

I have a good collection of $1 coins and know how 61 looks :)

The "resubmittal game" might very well produce yet another grade too !!

Could also easily be a mechanical error. Grader graded it a 64, types 64 on the numeric keypad on the computer and his finger slips down a little. What is right below the 4 on the keypad? Why it's a 1!

Your real mistake was cracking it out to send it back in to the same grading company. Should have just sent it in for a regrade still in the slab. You would have either gotten it back in the higher grade holder, left in the same holder, or if for some reason they did regrade it as a 61 you would have at least gotten paid for the difference in value. By cracking it you lost that payment.