Alpha v1.1.2_01 was the oldest Minecraft version where you could hear sounds and see player's skins from 2010/2011.
As of March 8, 2018, you cannot hear sounds or see player's skins in Minecraft versions up to 1.6.4, which is caused by Mojang removing old game resources.
Sounds can still be heard through usage of a proxy debugger or modifying the game, this same goes to skins.
This was the last version to feature the old terrain generator along with the bright green grass which was an iconic staple of Alpha.
In addition, due to the above, this was the last version in which the Far Lands would simply not render beyond 32,000,000 blocks out from the center of the map.
1.0