In the launcher, you will find a beta version called "Beta 1.6.3" which which shows up in the launcher as b1.6.3. However, there's another similarly named version, that's not the same. It's called "Beta 1.6 Test Build 3", which does not appear in the launcher at all. To download it, you need to go to Minecraft's official Amazon AWS website. The link is: https://s3.amazonaws.com/MinecraftDownload/prerelease/build.zip
In this zip file, you will find the minecraft.jar for "Beta 1.6 Test Build 3", as well as the and corresponding minecraft_server.jar for running a server if you want to.
In the launcher, you will find a beta version called "Beta 1.6.3" which which shows up in the launcher as b1.6.3. However, there's another similarly named version, that's not the same. It's called "Beta 1.6 Test Build 3", which does not appear in the launcher at all. To download it, you need to go to Minecraft's official Amazon AWS website. The link is: https://s3.amazonaws.com/MinecraftDownload/prerelease/build.zip
In this zip file, you will find the minecraft.jar for "Beta 1.6 Test Build 3", as well as the and corresponding minecraft_server.jar for running a server if you want to.
Yeah, this version of minecraft has been known for a while now. I believe Antvenom has even made a video on it.
Good discoverie, Videogamer555
Nice find, though i think i already have b1.6-tb3 on my version archive