Valve’s version numbering for the Source Engine can be cryptic to the uninitiated. The version typically corresponds to the engine branch running the game during a pivotal window in the early 2010s. While the game’s main menu might have displayed a different build number (often in the 5000s or 6000s during 2011-2012), the engine protocol 1.1.4.1 is synonymous with the Pre-Meet Your Match era, arguably hovering around the Uber Update (2011) or the Pyromania Update (2012) .
Version 1.1.4.1 specifically aligns with the early days of Trading and Item Quality. In these "All Items" distributions, players often have access to: TF2 Update History: The Goldrush Update Team Fortress 2 v 1.1.4.1 All Items