Hi guys. I'm a total novice when it comes to error coins. Y'all have been a great help so far. Hopefully you don't mind continuing to educate me. I'm unclear as to what constitutes a d/d. The obvious ones are...well...obvious, but what about the grey areas? I have attached a couple of pics. Are these double-dies? In any case, are the obvious ones worth way more than the maybes? If so, should the cardinal rule be 'when in doubt, don't waste your time?'
Thanks for any and all feedback!

