Argentina Buenos Ayres 1854 Medal

Does anyone have any information about this medal? It is 31mm, silver, 9.8 grams.

http://www.elfreeman2.com/t18/ayreso.jpg

http://www.elfreeman2.com/t18/ayresr.jpg

https://picclick.com/ARGENTINA-MEDAL-COIN-Proclamation-1854-271968557279.html

A source I found for a similar medal in gold says there were 2.575 struck in silver in total, though this number is not backed up by any source, and I am not sure if it is referring to your type:
http://www.icollector.com/Buenos-Aires-Argentina-gold-medal-1854-Constitution-struck-over-an-Ecuador-4-escudos-1839-very_i25873556

Thank you!