I'm glad to see you are posting FULL IMAGE photos now. It sure makes life easier to enlarge and view them. Thank you for that. The mint mark on your 1977 could be a small die chip, but most likely just circulation damage. Either way, NAV, IMHO.
Hope I'm not intruding, I have this 1977 Coin "Error" (questionable). Anyone info would be greatly appreciated. https://ibb.co/R0ZM7k8
Hi, welcome to CT. You need to post the images, most members will not open unknown links. Start your own thread and include clear, in focus FULL SIZE images and the knowledgeable people here will give you the benefit of their combined wisdom