Good evening. I am new to coin collecting and came across this in a…

Good evening. I am new to coin collecting and came across this in a roll of half dollars from my bank. It is raised on both ends, yet indents toward the middle. I couldn’t find enough information online on this particular coin. I am curious if it’s worth doing more research and/or if it’s post non damage vs. some sort of die crack mint error. Your thoughts?

Best regards,

Mrs. Eve
North Dakota