I have had this happen before. Definitely a jake in my face gobbling his fool head off like a mature bird.
I've also had what initially I thought was a jake because of a damaged short beard turn out to be a mature bird with a full fan and better than 1 inch spurs.
Sometimes a wheezy weak gobble turns out to be from a whopper old bird.
The lesson I've learned is don't make assumptions based on the gobble or beard size.