Taken from a few posts back on the main page:
"An easy way to tell if you have an older or newer bootrom is to check your serial, if the 4th and 5th digits are 40 or less, you’ve got an older bootrom. (ie – if my serial was 8B4387323 I’d be okay as my phone’s 4th and 5th digits are 38)"
According to that it looks like you have the old bootrom.
What OS are you using? It looks like iOS 4 because of the 05.13.04.
Have you been jailbroken before? If you're on iOS 4 and you never jailbroke pre-spirit I'm fairly certain you can't jailbreak or unlock your 3gs.