Your screen photo didn't bother me in the least. It very clearly shows what you're asking about. Others taken that way are so pixelated or whatever you call it that they're not useful.
Here is a direct link to the Lawrence book online. While it's old, it still has a wealth of useful information about Barber dimes
If you have any 1899-1905 dimes, particularly S mint, there are a bunch of transition varieties to look for. Some are not documented, they don't have any extra value that I know of, but fun to find. There are many repunched dates and mint marks throughout the series. The 1905-O "micro O" is popular, as well as the 1901-O over horizontal O.