That is basically the OAU emblem with seven rings, made in 1970, seven years after the OAU was founded.
There was a competition for the emblem design.
The prize for winning was $7,000.
http://www.afro-way.com/article/?aid=492http://www.standardmedia.co.ke/mobi...lem-and-flagI don't know who made the medal, but it was probably made in 2009.
From Wikipedia:
The Sirte Declaration was the resolution adopted by the Organisation of African Unity on 9 September 1999, at the fourth Extraordinary Session of the OAU Assembly of African Heads of State and Government held at Sirte, Libya.