I guess my eyes are trained to actually see stuff like this. It is one of my weaknesses. The mint mark placement and "c" are very similar in location to the VAM-9. While I am not saying your coin is a VAM-9, this is offered as a way to steer others into possibly seeing what you and I see.
Unfortunately, I don't think just the presence of a phantom "c" will ever convince anyone. From my experience, chasing this will lead to a dead end.
That being said, if it was my coin, I would search the reverse for other die markers (die poop if you will), and go to the Heritage archives and see if you can match up the die markers to a 93-cc or even a 92-cc reverse die.
Likely a futile exercise, but finding a new o/cc reverse die would be exciting. Might make for a way to kill some time on a cold winter weekend.