No Number Gentle Manne's Service Medal
This item was awarded to the first 11,111 players who visited a hidden page on the Classless Update website. Each medal has a 'Medal no.' assigned to it.
There are 38 un-numbered medals that were granted to Valve employees.
Source
Gentle Manne's Service Medal
Team Fortress 2 Limited Level 100 Medal
Given to those few brave soldiers whom stood guard valiantly without sleep, nourishment, or a social life.