yea, just damaged with age....do some research on known errors and spare yourself of taking photos of them all.
VERY common in the 1970's in general, for some reason I am unfamiliar with. But they are all over the place for some reason. I have solid date rolls in which 10 or more show it. More so in the earlier 70's, but still...
Here's an exercise you might like. Try lining up a year sequence, one per year. Then note how the spacing of the design elements change several times. There's one at 1969, another in 1982/3, depending on whether you get a LD or SD 1982, and several more subtle ones. These are known as rehubbings.
First of all, that's why I joined this forum, so I can learn more and second of all this is the fourth photo I take out of hundreds of coins I have.