It certainly looks like Bob’s signature circa early 1980s. However, I found at least one seller listing this exact same signed photo, as a reproduction, for $12 and change:
The seller has a mixture of different signed items, some JSA certified, others not. There are at least a couple, described as TTM, which I don’t like the look of, e.g. Cate Blanchett, Demi Moore.
As he’s selling this Dylan as a repro then there’s no foul, I guess. His listing could be clearer, mind. If it were an original, it’d be a $2,000+ item, easy.
There are very few bargains to be had with Dylan. His signature is expensive, difficult to authenticate, and widely faked, which makes him a prime target for forgers. Aside from lottery-winning luck, you’re unlikely to find an original for sale at less than $1,500. More attractive items, like signed photos and LP covers can sell for 3-4 times that starting price.