I am looking for information about the following medal:
Greyish metal (probably silver) Diameter 60.3 mm and 144.2 grammes (thickness: 5.45 mm)
O: ESTADOS UNIDOS MEXICANOS | (arms of Mexico - Eagle with snake on cactus)
R: (logo of the International Meeting on Cooperation and Development) | cancún 1981
The Mexican arms are like these on the 100 Pesos coin (KM483.1/2 (1977-79)).
The International Meeting on Cooperation and Development (North-South Summit) was held in the Mexican city of Cancún on 22 and 23 October 1981. It was attended by representatives of 22 countries from 5 continents. Some of the participants were: Kurt Waldhein (UN); Pierre Trudeau (Canada); François Mitterrand (France), Indira Gandhi (India), Margaret Thathcher (UK) and Ronald Reagen (USA). The conference was chaired by Mexican President José López Portillo.
I found one other commemorative medal for this conference listed. It is however much smaller, weighs 30 grammes and has a different design. There also was a stamp issued.
Possibly the medal shown was presented to the participants. I would like to know the number issued and the metal of which the medal was made. Information will be appreciated!