1.2.0 was an update for Team Fortress 2 Classic. It was released on January 1, 2015. It featured a few bug fixes. The patch notes are on the archived TF2C Wiki.
Here's another update.
Fixed the Engineer crash (thanks chipsnapper2)
Changed the main menu logo to the TF2 Classic logo (by Annoyed Grunt)
You'll equip it the next time you either visit a resupply cabinet, or the next time you respawn.