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If you want to be sure of your browser version open it and click on help (at the top). You should have a link with 'about communicator', or 'about navigator'. It should tell you the exact version you've got whn you click on it.
If you look at the archive on netscape website [wp.netscape.com] you notice that they don't have any explicit version 5. I think that they skip directly to the version 6 to 'beat' IE in the race of 'I have the latest' browser because at the time NN6 was produce IE was at version 5.5.
Version 6 and 7 are graphically completely different from 4 and below and I think they're both based on the same program structure that's why even though they're 6 and 7 they kept the codename 5.
Leo