I have the following proof coins with breaks in the middle of S mintmark: 1970 S 1C, 1969 S 5C and 1970 S 50C Sorry I'm unable to provide suitable pictures due to the very small size of the mintmarks. Would someone tell me if these attributes could be regarded as Mint Errors? Regards, Shyamal
Without photos, I'm guessing that these oddities are nothing more than partially grease-filled die errors. You can keep them if you want, but I wouldn't plan to retire any time soon if I were you.
Welcome to CT @sham, even Full Image photos would be of help as members can enlarge them. After you "upload" your photos, two buttons show. Thumbnail and Full Image, click on full image to put the photo in your post. When it is clicked on, it will automatically enlarge so it can be viewed better.