Olympic Movement flag
Proportions 2:3, created 1913, adopted 1914, first used 1920.

Colors as per http://fairspielen.de/wp-content/uploads/2015/09/Annexe-3-Olympism_and_the_Olympic_Symbol_-_Principles_and_Usages_Guide-1.pdf
blue: PMS 3005C
yellow: PMS 137C
black: PMS 426C
green: PMS 355C
red: PMS 192C
Dimensions of the rings taken from http://fairspielen.de/wp-content/uploads/2015/09/Annexe-3-Olympism_and_the_Olympic_Symbol_-_Principles_and_Usages_Guide-1.pdf
Originally uploaded at https://commons.wikimedia.org/wiki/File:Olympic_flag.svg
Manual reconstruction by Denelson83
Original author: Pierre de Coubertin (1863-1937)