The world’s oldest Quran in history got compiled in Madina by Othman, the third caliph of the Muslim world, and thus got named as the Othman Koran. Before him, the sacred verses that Allah Almighty revealed on Prophet (PBUH) were either memorized or written on pieces of wood or camel bone.
So in-order to prevent dispues about which versed should be considered divinely inspired, Othman compiled a completely definitive version. This book of Quran got completed in 651 AD only 19 years after the death of Prophet Muhammad (PBUH). This priceless Quran is kept in a special glass fronted vault built in a wall of a tiny inner room.
About one third of the original script stills survives today. It has around 250 pages with huge volume written in bold Arabic. It is to be believed that Caliph Othman made five copies of the original Quran. And a partial Quran in the Topkapi Place in Istanbul is considered to be a one of these copies.